Chelkarite Mineral Data

Chelkarite Mineral Data

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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)

IMA Status:

Approved IMA 1968

Locality:

Link to MinDat.org Location Data.

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.

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Chelkarite

Electron Density:

r_electron=3.01 gm/cc
note: r_Chelkarite=2.93 gm/cc.

Fermion Index

Fermion Index = 0.0198
Boson Index = 0.9802

Photoelectric:

PE_Chelkarite= 2.99 barns/electron
U=PE_Chelkarite x r_electron= 9.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Chelkarite is Not Radioactive

Chelkarite Classification

Dana Class:

26.7.2.1 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.7)Dana Type

(26.7.2)Dana Group

26.7.2.1 Chelkarite CaMgB2O4Cl2·7(H2O)(?) P bca 2/m 2/m 2/m

Strunz Class:

V/J.02-20 V - Nitrates, Carbonates and Borates

V/J - Chain borates with [B2O4]2- to [B6O10]2-

V/J.02 - Calciborite - Aldzhanite(?) series

V/J.02-10 Calciborite CaB2O4 Pccn 2/m 2/m 2/m

V/J.02-20 Chelkarite CaMgB2O4Cl2·7(H2O)(?) P bca 2/m 2/m 2/m

V/J.02-30 Aldzhanite? CaMgB2O4Cl·7(H2O)(?) Unk Ortho

Other Chelkarite Information

References:

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 -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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Translate Chelkarite Mineral Data :

Ask about Chelkarite here :
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Mindat.org's Discussion Groups
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Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Chelkarite

CaMgB2O4Cl2·7(H2O) (?)
Dana No: 26.7.2.1 Strunz No: V/J.02-20
Locality:

Notes: