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Name: Braunite RRUFF ID: R090057 Ideal Chemistry: Mn2+Mn3+6O8(SiO4) Locality: N'Chwaning III Mine, N'Chwaning Mines, Kalahari manganese field, Northern Cape Province, South Africa Source: Marshall Sussman Owner: RRUFF Description: Blocky lustrous black crystals on fine-grained matrix of the same material. Note that this is braunite II, as defined in de Villiers (1980) Status: The identification of this mineral has been confirmed by X-ray diffraction. |
| Mineral Group: [ Braunite (5) ] | ||
| Quick search: [ All Braunite samples (4) ] | ||
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| BROAD SCAN WITH SPECTRAL ARTIFACTS | ||||||||||||
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| POWDER DIFFRACTION | ||||||||
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| RRUFF ID: | R090057.1 | |||||||
| Sample Description: | Powder | |||||||
| Cell Refinement Output: |
a: 9.431(1)Å b: 9.431(1)Å c: 37.80(1)Å alpha: 90° beta: 90° gamma: 90° Volume: 3361.9(8)Å3 Crystal System: tetragonal |
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| REFERENCES for Braunite | |
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American Mineralogist Crystal Structure Database Record: [view record] |
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Anthony J W, Bideaux R A, Bladh K W, and Nichols M C (1990) Handbook of Mineralogy, Mineral Data Publishing, Tucson Arizona, USA, by permission of the Mineralogical Society of America. [view file] |
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Haidinger W (1826) On the crystalline forms and properties of the manganese ores, The Edinburgh Journal of Science, 4, 41-50 [view file] |
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Haidinger W (1828) Mineralogische Beschreibung der Manganerze IV. Brachytypes Manganerz, Braunit, Annalen der Physik und Chemie, 14, 197-211 [view file] |
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Turner E (1828) Chemical examination of the oxides of manganese. Part II. On the composition of the ores of manganese described by Mr. Haidinger, The Philosophical Magazine, 4, 96-104 [view file] |
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Aminoff G (1931) Lattice dimensions and space-group of braunite, Kunglig Svenska Vetenskapsakademiens Handlingar, 9, 14-22 [view file] |
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Abs-Wurmbach I, Langer K (1975) Synthetic Mn3+ kyanite and viridine, Al2-xMn3+x) SiO5, in the system Al2O3--MnO--MnO2--SiO2, Contributions to Mineralogy and Petrology, 49, 21-38 |
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Moore P B, Araki T (1976) Braunite: its structure and relationship to bixbyite, and some insights on the genealogy of fluorite derivative structures, American Mineralogist, 61, 1226-1240 [view file] |
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de Villiers J P R (1980) The crystal structure of braunite II and its relation to bixbyite and braunite, American Mineralogist, 65, 756-765 [view file] |
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Bhattacharyya P K, Dasgupta S, Fukuoka M, Roy S (1984) Geochemistry of braunite and associated phases in metamorphosed non-calcareous manganese ores of India, Contributions to Mineralogy and Petrology, 87, 65-71 |
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Robie R A, Huebner J S, Hemingway B S (1995) Heat capacities and thermodynamic properties of braunite (Mn7SiO12) and rhodonite (MnSiO3), American Mineralogist, 80, 560-575 [view file] |
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Marescotti P, Frezzotti M L (2000) Alteration of braunite ores from Eastern Ligeria (Italy) during syntectonic veining processes: mineralogy and fluid inclusions, European Journal of Mineralogy, 12, 341-356 |
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Bevan D J M, Martin R L (2008) The role of the coordination defect: A new structural description of four fluorite-related sesquioxide minerals, bixbyite (Mn2O3), braunite (Mn7SiO12), braunite II (CaMn14SiO24), parwelite (Mn10Sb2As2Si2O24), and their structural relationships, Journal of Solid State Chemistry, 181, 2250-2259 |
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