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Chelkarite Mineral Data

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General Chelkarite Information

Help on Chemical  Formula: Chemical Formula: CaMgB2O4Cl2•7(H2O) (?)
Help on Composition: Composition: Molecular Weight = 347.01 gm
   Calcium    11.55 %  Ca   16.16 % CaO
   Magnesium   7.00 %  Mg   11.61 % MgO
   Boron       6.23 %  B    20.06 % B2O3
   Hydrogen    4.07 %  H    36.34 % H2O
   Chlorine   20.43 %  Cl   20.43 % Cl
                -   %   Cl   -4.61 % -O=Cl2   
   Oxygen     50.72 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaMgB2O4Cl2•7(H2O)
Help on Environment: Environment: Insoluble residue of brines from a salt dome.
Help on IMA Status: IMA Status: Approved IMA 1968
Help on Locality: Locality: Chelkar salt dome, Ak-sat Valley, Uralsk district, Kazakhstan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.

Chelkarite Image

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Comments: Minute transparent nearly colorless microcrystals of chelkarite.
Location: Chelkar, Zapadno-Kazahstan, Kazakhstan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Chelkarite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6569:1:0.3963
Help on Cell Dimensions: Cell Dimensions: a = 13.69, b = 20.84, c = 8.26, Z = 12; V = 2,356.57 Den(Calc)= 2.93
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P bca
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.531(1), 10.42(0.9), 2.209(0.8),

Physical Properties of Chelkarite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Colorless.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Chelkarite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.362 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.184,KC= 0.2884
Ncalc = 1.85
Help on Optical Data: Optical Data: Biaxial (?), a=1.52, g=1.558, bire=0.0380

Calculated Properties of Chelkarite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.01 gm/cc
note: Specific Gravity of Chelkarite =2.93 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEChelkarite = 2.99 barns/electron
U=PEChelkarite x rElectron Density= 9.00 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chelkarite is Not Radioactive

Chelkarite Classification

Help on  Dana Class: Dana Class: (26)Hydrated Borates Containing Hydroxyl or Halogen
  (26.07)Dana Type
  (26.07.02)Dana Group Chelkarite CaMgB2O4Cl2•7(H2O)(?) P bca 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 06.HA.05 06 - BORATES
  06.H - Unclassified Borates
  06.HA -Unclassified borates
06.HA.05 Chelkarite CaMgB2O4Cl2•7(H2O)(?) P bca 2/m 2/m 2/m

Other Chelkarite Information

Help on References: References: NAME( AntBidBlaNic5) 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 Chelkarite :
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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CaMgB2O4Cl2•7(H2O) (?)
Dana No: Strunz No: 06.HA.05





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