Braunite R050390

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Record 3 of 4  

Name: Braunite
RRUFF ID: R050390
Ideal Chemistry: Mn2+Mn3+6O8(SiO4)
Locality: Oehrenstock, Thuringia, Germany
Source: University of Arizona Mineral Museum 7721 [view label]
Owner: RRUFF
Description: Mass of black octahedra
Status: The identification of this mineral has been confirmed by X-ray diffraction and chemical analysis
Mineral Group: [ Braunite (5) ]
Quick search: [ All Braunite samples (4) ]
RRUFF ID: R050390.2
Sample Description: Microprobe Fragment
Measured Chemistry: (Mn2+0.83Ca0.17)Σ=1Mn3+6.00Si1.00O12
Microprobe Data File: [ Download Excel File ]
Sample Description: Sample is oriented and mounted on a pin
Pin ID: M00051
Orientation: Laser parallel to  -a*  (-1 0 0).     Fiducial mark perpendicular to laser is parallel to  -c   [0 0 -1].

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RRUFF ID: R050390
Sample Description: Unoriented sample
Instrument settings: Thermo Almega XR 532nm @ 100% of 150mW
INFRARED SPECTRUM (Attenuated Total Reflectance) 
RRUFF ID: R050390.1
Instrument settings: SensIR Durascope on a Nicolet Magna 860 FTIR
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RRUFF ID: R050390.1
Sample Description: Powder
Cell Refinement Output: a: 9.4215(7)Å    b: 9.4215(7)Å    c: 18.692(2)Å
alpha: 90.°    beta: 90.°    gamma: 90.°   Volume: 1659.2(2)Å3    Crystal System: tetragonal
  File Type Information Close
Calculated diffraction file.

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Output file from the Bruker D8 Advance instrument. Includes device headers and XY data.

  File Type Information Close
Output file from the Bruker D8 Advance instrument. Includes device headers and XY data.

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REFERENCES for Braunite

American Mineralogist Crystal Structure Database Record: [view record]

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]

Haidinger W (1826) On the crystalline forms and properties of the manganese ores, The Edinburgh Journal of Science, 4, 41-50   [view file]

Haidinger W (1828) Mineralogische Beschreibung der Manganerze IV. Brachytypes Manganerz, Braunit, Annalen der Physik und Chemie, 14, 197-211   [view file]

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]

Aminoff G (1931) Lattice dimensions and space-group of braunite, Kunglig Svenska Vetenskapsakademiens Handlingar, 9, 14-22   [view file]

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

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]

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]

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

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]

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

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