Chelkarite Mineral Data

General Chelkarite Information

Chemical Formula:

CaMgB2O4Cl2•7(H2O) (?)

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

Empirical Formula:

CaMgB₂O₄Cl₂•7(H₂O)

Environment:

Insoluble residue of brines from a salt dome.

IMA Status:

Approved IMA 1968

Locality:

Chelkar salt dome, Ak-sat Valley, Uralsk district, Kazakhstan. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Chelkarite Image

Images:

Chelkarite

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

Axial Ratios:

a:b:c =0.6569:1:0.3963

Cell Dimensions:

a = 13.69, b = 20.84, c = 8.26, Z = 12; V = 2,356.57 Den(Calc)= 2.93

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P bca

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.531(1), 10.42(0.9), 2.209(0.8),

Physical Properties of Chelkarite

Cleavage:

{???} Perfect

Color:

Colorless.

Diaphaneity:

Transparent

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Chelkarite

Gladstone-Dale:

CI calc= 0.362 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.184,KC= 0.2884
Ncalc = 1.85

Optical Data:

Biaxial (?), a=1.52, g=1.558, bire=0.0380

Calculated Properties of Chelkarite

Electron Density:

Bulk Density (Electron Density)=3.01 gm/cc
note: Specific Gravity of Chelkarite =2.93 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Chelkarite= 2.99 barns/electron
U=PE_Chelkarite x rElectron Density= 9.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chelkarite is Not Radioactive

Chelkarite Classification

Dana Class:

26.07.02.01 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.07)Dana Type

(26.07.02)Dana Group

26.07.02.01 Chelkarite CaMgB2O4Cl2•7(H2O)(?) P bca 2/m 2/m 2/m

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

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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

Chelkarite

CaMgB2O4Cl2•7(H2O) (?)
Dana No: 26.07.02.01 Strunz No: 06.HA.05
Locality:

Notes: