Bararite Mineral Data

Bararite Mineral Data
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General Bararite Information

Help on Chemical Formula: Chemical Formula: (NH4)2SiF6
Help on Composition: Composition: Molecular Weight = 178.15 gm
   Silicon   15.76 %  Si   33.73 % SiO2
   Hydrogen   4.53 %  H      -   % Calc as (NH4)2O
   Nitrogen  15.72 %  N    29.23 % (NH4)2O
   Fluorine  63.98 %  F    63.98 % F
               -   %   F   -26.94 % -O=F2    
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (NH4)2SiF6
Help on Environment: Environment: Above a burning coal seam. Dimorphous with cryptohalite, the higher-temperature form.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1951
Help on Locality: Locality: Bararee colliery, Barari, Jharia coalfield, West Bengal, India. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Bararite Say BARARITE
Help on Synonym: Synonym: ICSD 18027
  PDF 44-1424
 

Bararite Image

Click Here for Larger Bararite Image in a New Browser Window Images:
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Bararite   Cryptohalite

Comments: White crystalline bararite intermixed with cryptohalite colored yellow by selenium.
Location: Shamokin, Northumberland County, Pennsylvani, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Bararite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:0.82812
Help on Cell Dimensions: Cell Dimensions: a = 5.76, c = 4.77, Z = 1; V = 137.05 Den(Calc)= 2.16
Help on Crystal System: Crystal System: Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m
Click Here for Large Bararite Structure Window Crystal Structure:

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Schlemper E O , Hamilton W C , Journal of Chemical Physics , 45 (1966) p.408-409, On the structure of trigonal ammonium fluorosilicate, Locality: synthetic

 

Physical Properties of Bararite

Help on Cleavage: Cleavage: {0001} Perfect
Help on Color: Color: White.
Help on Density: Density: 2.152
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Bararite

Help on Optical Data: Optical Data: Uniaxial (-), e=1.391, w=1.406, bire=0.0150.
 

Calculated Properties of Bararite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.18 gm/cc
note: Specific Gravity of Bararite =2.16 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.16
Boson Index = 0.84
Help on Photoelectric: Photoelectric: PEBararite = 0.97 barns/electron
U=PEBararite x rElectron Density= 2.12 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bararite is Not Radioactive
 

Bararite Classification
Help on Dana Class: Dana Class: 11.05.02.02 (11)Halide Complexes; Alumino-fluorides
  (11.05)where (A)m B (X)6
  (11.05.02)Malladrite Group
 
11.05.02.01 Malladrite Na2SiF6 P 321 3 2
 
11.05.02.02 Bararite (NH4)2SiF6 R 3m 3 2/m
 
11.05.02.03 Demartinite! K2[SiF6] P 63mc 6mm
Help on Strunz Class: Strunz Class: 03.CH.10 03 - HALIDES
  03.C - Complex Halides
  03.CH -
 
03.CH.10 Bararite (NH4)2SiF6 R 3m 3 2/m
 

Other Bararite Information
Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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Bararite

(NH4)2SiF6
Dana No: 11.05.02.02 Strunz No: 03.CH.10
Locality:

 

Notes: