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Bararite Mineral Data
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General Bararite Information
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Chemical Formula: |
(NH4)2SiF6 |
Composition: |
Molecular Weight = 178.15 gm |
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Silicon 15.76 % Si 33.73 % SiO2 |
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Hydrogen 4.53 % H - % Calc as (NH4)2O |
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Nitrogen 15.72 % N 29.23 % (NH4)2O |
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Fluorine 63.98 % F 63.98 % F |
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- %
F -26.94 % -O=F2 |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
(NH4)2SiF6 |
Environment: |
Above a burning coal seam. Dimorphous with cryptohalite, the higher-temperature form. |
IMA Status: |
Valid Species (Pre-IMA) 1951 |
Locality: |
Bararee colliery, Barari, Jharia coalfield, West Bengal, India. Link to MinDat.org Location Data. |
Name Origin: |
Named for the locality. |
Name Pronunciation: |
Bararite |
Synonym: |
ICSD 18027 |
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PDF 44-1424 |
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Bararite Image |
Images:
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Bararite Crystallography
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Axial Ratios: |
a:c = 1:0.82812 |
Cell Dimensions: |
a = 5.76, c = 4.77, Z = 1; V = 137.05 Den(Calc)= 2.16 |
Crystal System: |
Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m |
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Physical Properties of Bararite
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Cleavage: |
{0001} Perfect |
Color: |
White. |
Density: |
2.152 |
Hardness: |
2.5 - Finger Nail |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
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Optical Properties of Bararite
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Optical Data: |
Uniaxial (-), e=1.391, w=1.406, bire=0.0150. |
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Calculated Properties of Bararite
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Electron Density: |
Bulk Density (Electron Density)=2.18 gm/cc note: Specific Gravity of Bararite =2.16 gm/cc. |
Fermion Index: |
Fermion Index = 0.16 Boson Index = 0.84 |
Photoelectric: |
PEBararite = 0.97 barns/electron U=PEBararite x rElectron Density= 2.12 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Bararite is Not Radioactive |
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Bararite Classification
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Dana Class: |
11.05.02.02 (11)Halide Complexes; Alumino-fluorides |
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(11.05)where (A)m B (X)6 |
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(11.05.02)Malladrite Group |
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11.05.02.01 Malladrite Na2SiF6 P 321 3 2 |
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11.05.02.02 Bararite (NH4)2SiF6 R 3m 3 2/m |
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11.05.02.03 Demartinite! K2[SiF6] P 63mc 6mm |
Strunz Class: |
03.CH.10 03 - HALIDES |
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03.C - Complex Halides |
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03.CH - |
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03.CH.10 Bararite (NH4)2SiF6 R 3m 3 2/m |
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Other Bararite Information
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References: |
NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
See Also: |
Links to other databases for Bararite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
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Print or Cut-and-Paste your Bararite Specimen Label here :
Bararite
(NH4)2SiF6
Dana No: 11.05.02.02 Strunz No: 03.CH.10
Locality:
Notes:
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