Bararite Mineral Data + Say BARARITE

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 IMA Status: IMA Status: Valid Species (Pre-IMA) 1951
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Synonym: Synonym: ICSD 18027
  PDF 44-1424
 

Bararite Image

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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
 

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 Gladstone-Dale: Gladstone-Dale: CI meas= -0.848 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.841 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1845,KPDmeas= 0.1852,KC= 0.1002
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:

relectron=2.18 gm/cc
note: rBararite =2.16 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.16403
Boson Index = 0.83597
Help on Photoelectric: Photoelectric:

PEBararite = 0.97 barns/electron
U=PEBararite x relectron= 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: 11.5.2.2 (11)Halide Complexes; Alumino-fluorides
  (11.5)where (A)m B (X)6
  (11.5.2)Dana Group
 
11.5.2.1 Malladrite Na2SiF6 P 321 3 2
 
11.5.2.2 Bararite (NH4)2SiF6 R 3m 3 2/m
Help on  Strunz Class: Strunz Class: III/B.02-40 III - Halogenides
  III/B - Double halogenides without water, with [BF4]1-,[SiF6]2- and [AlF6]3-
  III/B.02 - Mallardite - Bararite series
 
III/B.02-10 Malladrite Na2SiF6 P 321 3 2
 
III/B.02-20 Hieratite K2SiF6 F m3m 4/m 3 2/m
 
III/B.02-30 Cryptohalite (NH4)2SiF6 F m3m 4/m 3 2/m
 
III/B.02-40 Bararite (NH4)2SiF6 R 3m 3 2/m
 

Other Bararite Information

Help on References: References: 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Bararite Specimen Label here :

Bararite

(NH4)2SiF6
Dana No: 11.5.2.2 Strunz No: III/B.02-40
Locality:

 

Notes:

 

 
   
 
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