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Ray L. Frost - One of the best experts on this subject based on the ideXlab platform.
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thermal analysis x ray diffraction and infrared emission spectroscopy of the Borate Mineral meyerhofferite cab3o3 oh 5 h2o
Journal of Thermal Analysis and Calorimetry, 2017Co-Authors: Ray L. Frost, Ricardo Scholz, Xiuxiu RuanAbstract:Meyerhofferite is a calcium hydrated Borate Mineral with formula Ca2(H3B3O7)2·4H2O and occurs as white complex acicular to crude crystals in sedimentary or lake-bed Borate deposits. Simultaneous thermogravimetric analysis (TG) and derivative thermal analysis were performed. The TG curve shows a main decomposition at 195 °C followed by a second decomposition centered at about 436 °C. The total loss of mass is 28.1 % upon heating up to 1000 °C. The decomposition of meyerhofferite is also followed by the infrared emission spectra. A very sharp peak is observed at 3614 cm−1 in the 100 °C spectrum, which is attributed to the stretching vibration of OH units. This band shows a red shift with increasing temperature. The intensity of this band is lost by 250 °C. X-ray powder diffraction of the product of heating at 200 and 650 °C shows an amorphous phase, and at temperature up to 1000 °C is observed a partial reordering of the crystal structure, including calcium hexaboride, boron oxide, calcium peroxide, as well as unidentified phases.
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thermal analysis and infrared emission spectroscopy of the Borate Mineral colemanite cab 3 o 4 oh 3 h 2 o
Journal of Thermal Analysis and Calorimetry, 2016Co-Authors: Ray L. Frost, Ricardo Scholz, Xiuxiu Ruan, Rosa Malena Fernandes LimaAbstract:Colemanite CaB3O4(OH)3·H2O is a secondary Borate Mineral formed from borax and ulexite in evaporate deposits of alkaline lacustrine sediments. The basic structure of colemanite contains endless chains of interlocking BO2(OH) triangles and BO3(OH) tetrahedrons with the calcium, water and extra hydroxide units interspersed between these chains. We have studied the thermal decomposition of colemanite by using a combination of thermal analysis (TG/DTG) and infrared emission spectroscopy (IES). Thermogravimetric analysis of the colemanite Mineral was obtained by using TA Instruments Inc. Q50 high-resolution TGA operating at a 10 °C min−1 ramp with data sample interval of 0.50 s pt−1 from room temperature to 1000 °C in a high-purity flowing nitrogen atmosphere (100 cm3 min−1). Thermogravimetric analysis shows a sharp mass loss at 400.9 °C. Only a single mass loss is observed. IES shows a sharp band at 3610 cm−1 assigned to the stretching vibration of hydroxyl units. Intensity in this band is lost by 350 °C. A broad spectral feature is observed at 3274 cm−1 attributed to water stretching vibrations. Intensity in this band is lost by 300 °C. A combination of thermogravimetry and IES is used to study the thermal stability of the Borate Mineral colemanite. It is important to characterize the very wide range of Borate Minerals including colemanite because of the very wide range of applications of boron-containing Minerals.
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raman and infrared spectroscopic study of the Borate Mineral kaliborite
Spectroscopy Letters, 2015Co-Authors: Andrés López, Ricardo Scholz, Ray L. FrostAbstract:We have studied the Mineral kaliborite. The sample originated from the Inder B deposit, Atyrau Province, Kazakhstan, and is part of the collection of the Geology Department of the Federal University of Ouro Preto, Minas Gerais, Brazil. The Mineral is characterized by a single intense Raman band at 756 cm−1 assigned to the symmetric stretching modes of trigonal boron. Raman bands at 1229 and 1309 cm−1 are assigned to hydroxyl in-plane bending modes of boron hydroxyl units. Raman bands are resolved at 2929, 3041, 3133, 3172, 3202, 3245, 3336, 3398, and 3517 cm−1. These Raman bands are assigned to water stretching vibrations. A very intense sharp Raman band at 3597 cm−1 with a shoulder band at 3590 cm−1 is assigned to the stretching vibration of the hydroxyl units. The Raman data are complimented with infrared data and compared with the spectrum of kaliborite downloaded from the Arizona State University database. Differences are noted between the spectrum obtained in this work and that from the Arizona State...
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the molecular structure of the Borate Mineral szaibelyite mgbo2 oh a vibrational spectroscopic study
Journal of Molecular Structure, 2015Co-Authors: Ray L. Frost, Ricardo Scholz, Andrés López, Fernanda Maria BelottiAbstract:Abstract We have studied the Borate Mineral szaibelyite MgBO 2 (OH) using electron microscopy and vibrational spectroscopy. EDS spectra show a phase composed of Mg with minor amounts of Fe. Both tetrahedral and trigonal boron units are observed. The nominal resolution of the Raman spectrometer is of the order of 2 cm −1 and as such is sufficient enough to identify separate bands for the stretching bands of the two boron isotopes. The Raman band at 1099 cm −1 with a shoulder band at 1093 cm −1 is assigned to BO stretching vibration. Raman bands at 1144, 1157, 1229, 1318 cm −1 are attributed to the BOH in-plane bending modes. Raman bands at 836 and 988 cm −1 are attributed to the antisymmetric stretching modes of tetrahedral boron. The infrared bands at 3559 and 3547 cm −1 are assigned to hydroxyl stretching vibrations. Broad infrared bands at 3269 and 3398 cm −1 are assigned to water stretching vibrations. Infrared bands at 1306, 1352, 1391, 1437 cm −1 are assigned to the antisymmetric stretching vibrations of trigonal boron. Vibrational spectroscopy enables aspects of the molecular structure of the Borate Mineral szaibelyite to be assessed.
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vibrational spectroscopy of the Borate Mineral priceite implications for the molecular structure
Spectroscopy Letters, 2015Co-Authors: Ray L. Frost, Andrés López, Ricardo ScholzAbstract:ABSTRACT Priceite is a calcium Borate Mineral and occurs as white crystals in the monoclinic pyramidal crystal system. We have used a combination of Raman spectroscopy with complimentary infrared spectroscopy and scanning electron microscopy with Energy-dispersive X-ray Spectroscopy (EDS) to study the Mineral priceite. Chemical analysis shows a pure phase consisting of B and Ca only. Raman bands at 956, 974, 991, and 1019 cm−1 are assigned to the BO stretching vibration of the B10O19 units. Raman bands at 1071, 1100, 1127, 1169, and 1211 cm−1 are attributed to the BOH in-plane bending modes. The intense infrared band at 805 cm−1 is assigned to the trigonal Borate stretching modes. The Raman band at 674 cm−1 together with bands at 689, 697, 736, and 602 cm−1 are assigned to the trigonal and tetrahedral Borate bending modes. Raman spectroscopy in the hydroxyl stretching region shows a series of bands with intense Raman band at 3555 cm−1 with a distinct shoulder at 3568 cm−1. Other bands in this spectral reg...
Ricardo Scholz - One of the best experts on this subject based on the ideXlab platform.
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thermal analysis x ray diffraction and infrared emission spectroscopy of the Borate Mineral meyerhofferite cab3o3 oh 5 h2o
Journal of Thermal Analysis and Calorimetry, 2017Co-Authors: Ray L. Frost, Ricardo Scholz, Xiuxiu RuanAbstract:Meyerhofferite is a calcium hydrated Borate Mineral with formula Ca2(H3B3O7)2·4H2O and occurs as white complex acicular to crude crystals in sedimentary or lake-bed Borate deposits. Simultaneous thermogravimetric analysis (TG) and derivative thermal analysis were performed. The TG curve shows a main decomposition at 195 °C followed by a second decomposition centered at about 436 °C. The total loss of mass is 28.1 % upon heating up to 1000 °C. The decomposition of meyerhofferite is also followed by the infrared emission spectra. A very sharp peak is observed at 3614 cm−1 in the 100 °C spectrum, which is attributed to the stretching vibration of OH units. This band shows a red shift with increasing temperature. The intensity of this band is lost by 250 °C. X-ray powder diffraction of the product of heating at 200 and 650 °C shows an amorphous phase, and at temperature up to 1000 °C is observed a partial reordering of the crystal structure, including calcium hexaboride, boron oxide, calcium peroxide, as well as unidentified phases.
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thermal analysis and infrared emission spectroscopy of the Borate Mineral colemanite cab 3 o 4 oh 3 h 2 o
Journal of Thermal Analysis and Calorimetry, 2016Co-Authors: Ray L. Frost, Ricardo Scholz, Xiuxiu Ruan, Rosa Malena Fernandes LimaAbstract:Colemanite CaB3O4(OH)3·H2O is a secondary Borate Mineral formed from borax and ulexite in evaporate deposits of alkaline lacustrine sediments. The basic structure of colemanite contains endless chains of interlocking BO2(OH) triangles and BO3(OH) tetrahedrons with the calcium, water and extra hydroxide units interspersed between these chains. We have studied the thermal decomposition of colemanite by using a combination of thermal analysis (TG/DTG) and infrared emission spectroscopy (IES). Thermogravimetric analysis of the colemanite Mineral was obtained by using TA Instruments Inc. Q50 high-resolution TGA operating at a 10 °C min−1 ramp with data sample interval of 0.50 s pt−1 from room temperature to 1000 °C in a high-purity flowing nitrogen atmosphere (100 cm3 min−1). Thermogravimetric analysis shows a sharp mass loss at 400.9 °C. Only a single mass loss is observed. IES shows a sharp band at 3610 cm−1 assigned to the stretching vibration of hydroxyl units. Intensity in this band is lost by 350 °C. A broad spectral feature is observed at 3274 cm−1 attributed to water stretching vibrations. Intensity in this band is lost by 300 °C. A combination of thermogravimetry and IES is used to study the thermal stability of the Borate Mineral colemanite. It is important to characterize the very wide range of Borate Minerals including colemanite because of the very wide range of applications of boron-containing Minerals.
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raman and infrared spectroscopic study of the Borate Mineral kaliborite
Spectroscopy Letters, 2015Co-Authors: Andrés López, Ricardo Scholz, Ray L. FrostAbstract:We have studied the Mineral kaliborite. The sample originated from the Inder B deposit, Atyrau Province, Kazakhstan, and is part of the collection of the Geology Department of the Federal University of Ouro Preto, Minas Gerais, Brazil. The Mineral is characterized by a single intense Raman band at 756 cm−1 assigned to the symmetric stretching modes of trigonal boron. Raman bands at 1229 and 1309 cm−1 are assigned to hydroxyl in-plane bending modes of boron hydroxyl units. Raman bands are resolved at 2929, 3041, 3133, 3172, 3202, 3245, 3336, 3398, and 3517 cm−1. These Raman bands are assigned to water stretching vibrations. A very intense sharp Raman band at 3597 cm−1 with a shoulder band at 3590 cm−1 is assigned to the stretching vibration of the hydroxyl units. The Raman data are complimented with infrared data and compared with the spectrum of kaliborite downloaded from the Arizona State University database. Differences are noted between the spectrum obtained in this work and that from the Arizona State...
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the molecular structure of the Borate Mineral szaibelyite mgbo2 oh a vibrational spectroscopic study
Journal of Molecular Structure, 2015Co-Authors: Ray L. Frost, Ricardo Scholz, Andrés López, Fernanda Maria BelottiAbstract:Abstract We have studied the Borate Mineral szaibelyite MgBO 2 (OH) using electron microscopy and vibrational spectroscopy. EDS spectra show a phase composed of Mg with minor amounts of Fe. Both tetrahedral and trigonal boron units are observed. The nominal resolution of the Raman spectrometer is of the order of 2 cm −1 and as such is sufficient enough to identify separate bands for the stretching bands of the two boron isotopes. The Raman band at 1099 cm −1 with a shoulder band at 1093 cm −1 is assigned to BO stretching vibration. Raman bands at 1144, 1157, 1229, 1318 cm −1 are attributed to the BOH in-plane bending modes. Raman bands at 836 and 988 cm −1 are attributed to the antisymmetric stretching modes of tetrahedral boron. The infrared bands at 3559 and 3547 cm −1 are assigned to hydroxyl stretching vibrations. Broad infrared bands at 3269 and 3398 cm −1 are assigned to water stretching vibrations. Infrared bands at 1306, 1352, 1391, 1437 cm −1 are assigned to the antisymmetric stretching vibrations of trigonal boron. Vibrational spectroscopy enables aspects of the molecular structure of the Borate Mineral szaibelyite to be assessed.
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vibrational spectroscopy of the Borate Mineral priceite implications for the molecular structure
Spectroscopy Letters, 2015Co-Authors: Ray L. Frost, Andrés López, Ricardo ScholzAbstract:ABSTRACT Priceite is a calcium Borate Mineral and occurs as white crystals in the monoclinic pyramidal crystal system. We have used a combination of Raman spectroscopy with complimentary infrared spectroscopy and scanning electron microscopy with Energy-dispersive X-ray Spectroscopy (EDS) to study the Mineral priceite. Chemical analysis shows a pure phase consisting of B and Ca only. Raman bands at 956, 974, 991, and 1019 cm−1 are assigned to the BO stretching vibration of the B10O19 units. Raman bands at 1071, 1100, 1127, 1169, and 1211 cm−1 are attributed to the BOH in-plane bending modes. The intense infrared band at 805 cm−1 is assigned to the trigonal Borate stretching modes. The Raman band at 674 cm−1 together with bands at 689, 697, 736, and 602 cm−1 are assigned to the trigonal and tetrahedral Borate bending modes. Raman spectroscopy in the hydroxyl stretching region shows a series of bands with intense Raman band at 3555 cm−1 with a distinct shoulder at 3568 cm−1. Other bands in this spectral reg...
Andrés López - One of the best experts on this subject based on the ideXlab platform.
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raman and infrared spectroscopic study of the Borate Mineral kaliborite
Spectroscopy Letters, 2015Co-Authors: Andrés López, Ricardo Scholz, Ray L. FrostAbstract:We have studied the Mineral kaliborite. The sample originated from the Inder B deposit, Atyrau Province, Kazakhstan, and is part of the collection of the Geology Department of the Federal University of Ouro Preto, Minas Gerais, Brazil. The Mineral is characterized by a single intense Raman band at 756 cm−1 assigned to the symmetric stretching modes of trigonal boron. Raman bands at 1229 and 1309 cm−1 are assigned to hydroxyl in-plane bending modes of boron hydroxyl units. Raman bands are resolved at 2929, 3041, 3133, 3172, 3202, 3245, 3336, 3398, and 3517 cm−1. These Raman bands are assigned to water stretching vibrations. A very intense sharp Raman band at 3597 cm−1 with a shoulder band at 3590 cm−1 is assigned to the stretching vibration of the hydroxyl units. The Raman data are complimented with infrared data and compared with the spectrum of kaliborite downloaded from the Arizona State University database. Differences are noted between the spectrum obtained in this work and that from the Arizona State...
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the molecular structure of the Borate Mineral szaibelyite mgbo2 oh a vibrational spectroscopic study
Journal of Molecular Structure, 2015Co-Authors: Ray L. Frost, Ricardo Scholz, Andrés López, Fernanda Maria BelottiAbstract:Abstract We have studied the Borate Mineral szaibelyite MgBO 2 (OH) using electron microscopy and vibrational spectroscopy. EDS spectra show a phase composed of Mg with minor amounts of Fe. Both tetrahedral and trigonal boron units are observed. The nominal resolution of the Raman spectrometer is of the order of 2 cm −1 and as such is sufficient enough to identify separate bands for the stretching bands of the two boron isotopes. The Raman band at 1099 cm −1 with a shoulder band at 1093 cm −1 is assigned to BO stretching vibration. Raman bands at 1144, 1157, 1229, 1318 cm −1 are attributed to the BOH in-plane bending modes. Raman bands at 836 and 988 cm −1 are attributed to the antisymmetric stretching modes of tetrahedral boron. The infrared bands at 3559 and 3547 cm −1 are assigned to hydroxyl stretching vibrations. Broad infrared bands at 3269 and 3398 cm −1 are assigned to water stretching vibrations. Infrared bands at 1306, 1352, 1391, 1437 cm −1 are assigned to the antisymmetric stretching vibrations of trigonal boron. Vibrational spectroscopy enables aspects of the molecular structure of the Borate Mineral szaibelyite to be assessed.
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vibrational spectroscopy of the Borate Mineral priceite implications for the molecular structure
Spectroscopy Letters, 2015Co-Authors: Ray L. Frost, Andrés López, Ricardo ScholzAbstract:ABSTRACT Priceite is a calcium Borate Mineral and occurs as white crystals in the monoclinic pyramidal crystal system. We have used a combination of Raman spectroscopy with complimentary infrared spectroscopy and scanning electron microscopy with Energy-dispersive X-ray Spectroscopy (EDS) to study the Mineral priceite. Chemical analysis shows a pure phase consisting of B and Ca only. Raman bands at 956, 974, 991, and 1019 cm−1 are assigned to the BO stretching vibration of the B10O19 units. Raman bands at 1071, 1100, 1127, 1169, and 1211 cm−1 are attributed to the BOH in-plane bending modes. The intense infrared band at 805 cm−1 is assigned to the trigonal Borate stretching modes. The Raman band at 674 cm−1 together with bands at 689, 697, 736, and 602 cm−1 are assigned to the trigonal and tetrahedral Borate bending modes. Raman spectroscopy in the hydroxyl stretching region shows a series of bands with intense Raman band at 3555 cm−1 with a distinct shoulder at 3568 cm−1. Other bands in this spectral reg...
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structural characterization of the Borate Mineral inyoite cab3o3 oh 5 4 h2o
Journal of Molecular Structure, 2015Co-Authors: Ray L. Frost, Ricardo Scholz, Andrés López, Frederick L Theiss, Geraldo Magela Da ,costaAbstract:We have studied the Mineral Ca(H4B3O7)(OH)⋅4(H2O) or CaB3O3(OH)5⋅4(H2O) using electron microscopy and vibrational spectroscopy. The Mineral has been characterized by a range of techniques including X-ray diffraction, thermal analysis, electron microscopy with EDX and vibrational spectroscopy. Electron microscopy shows a pure phase and the chemical analysis shows the presence of calcium only. The nominal resolution of the Raman spectrometer is of the order of 2 cm−1 and as such is sufficient enough to identify separate bands for the stretching bands of the two boron isotopes. Raman and infrared bands are assigned to the stretching and bending modes of trigonal and tetrahedral boron and the stretching modes of the hydroxyl and water units. By using a combination of techniques we have characterized the Borate Mineral inyoite.
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Raman and Infrared Spectroscopic Study of the Borate Mineral Kaliborite
Spectroscopy Letters, 2015Co-Authors: Andrés López, Ricardo Scholz, Ray L. FrostAbstract:Copyright © Taylor & Francis Group, LLC.We have studied the Mineral kaliborite. The sample originated from the Inder B deposit, Atyrau Province, Kazakhstan, and is part of the collection of the Geology Department of the Federal University of Ouro Preto, Minas Gerais, Brazil. The Mineral is characterized by a single intense Raman band at 756 cm-1 assigned to the symmetric stretching modes of trigonal boron. Raman bands at 1229 and 1309 cm-1 are assigned to hydroxyl in-plane bending modes of boron hydroxyl units. Raman bands are resolved at 2929, 3041, 3133, 3172, 3202, 3245, 3336, 3398, and 3517 cm-1. These Raman bands are assigned to water stretching vibrations. A very intense sharp Raman band at 3597 cm-1 with a shoulder band at 3590 cm-1 is assigned to the stretching vibration of the hydroxyl units. The Raman data are complimented with infrared data and compared with the spectrum of kaliborite downloaded from the Arizona State University database. Differences are noted between the spectrum obtained in this work and that from the Arizona State University database. This research shows that Minerals stored in a museum Mineral collection age with time. Vibrational spectroscopy enhances our knowledge of the molecular structure of kaliborite. © 2015
Xiuxiu Ruan - One of the best experts on this subject based on the ideXlab platform.
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thermal analysis x ray diffraction and infrared emission spectroscopy of the Borate Mineral meyerhofferite cab3o3 oh 5 h2o
Journal of Thermal Analysis and Calorimetry, 2017Co-Authors: Ray L. Frost, Ricardo Scholz, Xiuxiu RuanAbstract:Meyerhofferite is a calcium hydrated Borate Mineral with formula Ca2(H3B3O7)2·4H2O and occurs as white complex acicular to crude crystals in sedimentary or lake-bed Borate deposits. Simultaneous thermogravimetric analysis (TG) and derivative thermal analysis were performed. The TG curve shows a main decomposition at 195 °C followed by a second decomposition centered at about 436 °C. The total loss of mass is 28.1 % upon heating up to 1000 °C. The decomposition of meyerhofferite is also followed by the infrared emission spectra. A very sharp peak is observed at 3614 cm−1 in the 100 °C spectrum, which is attributed to the stretching vibration of OH units. This band shows a red shift with increasing temperature. The intensity of this band is lost by 250 °C. X-ray powder diffraction of the product of heating at 200 and 650 °C shows an amorphous phase, and at temperature up to 1000 °C is observed a partial reordering of the crystal structure, including calcium hexaboride, boron oxide, calcium peroxide, as well as unidentified phases.
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thermal analysis and infrared emission spectroscopy of the Borate Mineral colemanite cab 3 o 4 oh 3 h 2 o
Journal of Thermal Analysis and Calorimetry, 2016Co-Authors: Ray L. Frost, Ricardo Scholz, Xiuxiu Ruan, Rosa Malena Fernandes LimaAbstract:Colemanite CaB3O4(OH)3·H2O is a secondary Borate Mineral formed from borax and ulexite in evaporate deposits of alkaline lacustrine sediments. The basic structure of colemanite contains endless chains of interlocking BO2(OH) triangles and BO3(OH) tetrahedrons with the calcium, water and extra hydroxide units interspersed between these chains. We have studied the thermal decomposition of colemanite by using a combination of thermal analysis (TG/DTG) and infrared emission spectroscopy (IES). Thermogravimetric analysis of the colemanite Mineral was obtained by using TA Instruments Inc. Q50 high-resolution TGA operating at a 10 °C min−1 ramp with data sample interval of 0.50 s pt−1 from room temperature to 1000 °C in a high-purity flowing nitrogen atmosphere (100 cm3 min−1). Thermogravimetric analysis shows a sharp mass loss at 400.9 °C. Only a single mass loss is observed. IES shows a sharp band at 3610 cm−1 assigned to the stretching vibration of hydroxyl units. Intensity in this band is lost by 350 °C. A broad spectral feature is observed at 3274 cm−1 attributed to water stretching vibrations. Intensity in this band is lost by 300 °C. A combination of thermogravimetry and IES is used to study the thermal stability of the Borate Mineral colemanite. It is important to characterize the very wide range of Borate Minerals including colemanite because of the very wide range of applications of boron-containing Minerals.
Cristiano Lana - One of the best experts on this subject based on the ideXlab platform.
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the molecular structure of the Borate Mineral rhodizite k cs al4be4 b be 12o28 a vibrational spectroscopic study
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2014Co-Authors: Ray L. Frost, Ricardo Scholz, Andrés López, Larissa Souza, Cristiano LanaAbstract:We have studied the Borate Mineral rhodizite (K, Cs)Al4Be4(B, Be)12O28 using a combination of DEM with EDX and vibrational spectroscopic techniques. The Mineral occurs as colorless, gray, yellow to white crystals in the triclinic crystal system. The studied sample is from the Antandrokomby Mine, Sahatany valley, Madagascar. The Mineral is prized as a semi-precious jewel. Semi-quantitative chemical composition shows a Al, Ca, Borate with minor amounts of K, Mg and Cs. The Mineral has a characteristic Borate Raman spectrum and bands are assigned to the stretching and bending modes of B, Be and Al. No Raman bands in the OH stretching region were observed.
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vibrational spectroscopy of the Borate Mineral gaudefroyite ca4mn3 3 x bo3 3 co3 o oh from n chwaning ii mine kalahari republic of south africa
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2014Co-Authors: Ray L. Frost, Ricardo Scholz, Andres Lopes, željka žigovecki Gobac, Cristiano LanaAbstract:Abstract Gaudefroyite Ca 4 Mn 3 - x 3 + ( BO 3 ) 3 ( CO 3 ) ( O,OH ) 3 is an unusual Mineral containing both Borate and carbonate groups and is found in the oxidation zones of manganese Minerals, and it is black in color. Vibrational spectroscopy has been used to explore the molecular structure of gaudefroyite. Gaudefroyite crystals are short dipyramidal or prismatic with prominent pyramidal terminations, to 5 cm. Two very sharp Raman bands at 927 and 1076 cm−1 are assigned to trigonal Borate and carbonate respectively. Broad Raman bands at 1194, 1219 and 1281 cm−1 are attributed to BOH in-plane bending modes. Raman bands at 649 and 670 cm−1 are assigned to the bending modes of trigonal and tetrahedral boron. Infrared spectroscopy supports these band assignments. Raman bands in the OH stretching region are of a low intensity. The combination of Raman and infrared spectroscopy enables the assessment of the molecular structure of gaudefroyite to be made.