Chelyabinskite Mineral Data

General Chelyabinskite Information

Chemical Formula:

(Ca,Mg)3Si(OH)6(SO4,CO3)2•9(H2O)

Composition:

Molecular Weight = 574.77 gm

Calcium 15.69 % Ca 21.95 % CaO

Magnesium 3.17 % Mg 5.26 % MgO

Silicon 4.89 % Si 10.45 % SiO₂

Hydrogen 4.21 % H 37.61 % H₂O

Carbon 1.04 % C 3.83 % CO₂

Sulfur 8.37 % S 20.89 % SO₃

Oxygen 62.63 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca_2.25Mg_0.75Si(OH)₆(SO₄)_1.5(CO₃)_0.5•9(H₂O)

IMA Status:

Not Approved IMA

Locality:

Link to MinDat.org Location Data.

Chelyabinskite Crystallography

Axial Ratios:

a:b:c =0.9082:1:1.0726

Cell Dimensions:

a = 19.01, b = 20.93, c = 22.45, Z = 18; V = 8,932.39 Den(Calc)= 1.92

Crystal System:

Orthorhombic Space Group: Unk

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

By Intensity(I/I_o): 9.52(1), 9.86(1), 3.79(0.8),

Physical Properties of Chelyabinskite

Color:

White.

Density:

1.908 - 1.912, Average = 1.91

Diaphaneity:

Transparent to Translucent

Hardness:

3 - Calcite

Luster:

Silky

Streak:

white

Optical Properties of Chelyabinskite

Gladstone-Dale:

CI meas= -0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2566,KPDmeas= 0.2579,KC= 0.2513
Ncalc = 1.48

Optical Data:

Biaxial (?), a=1.475, b=1.495, g=1.508, bire=0.0330, 2V(Calc)=76, 2V(Meas)=77.

Calculated Properties of Chelyabinskite

Electron Density:

Bulk Density (Electron Density)=2.00 gm/cc
note: Specific Gravity of Chelyabinskite =1.92 gm/cc.

Fermion Index:

Fermion Index = 0.0067147226
Boson Index = 0.9932852774

Photoelectric:

PE_{Chelyabinskite}= 2.73 barns/electron
U=PE_{Chelyabinskite} x rElectron Density= 5.46 barns/cc.

Radioactivity:

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

Chelyabinskite Classification

Dana Class:

78.00.00.00 (78)Unclassified Silicate Minerals

(78.00)Without Dana Classification Numbers

(78.00.00)Unclassified Silicate

78.00.00.00 Almbosite? Fe5Fe4V4Si3O27 Ortho ? Ortho

78.00.00.00 Chelyabinskite* (Ca,Mg)3Si(OH)6(SO4,CO3)2•9(H2O) Unk Ortho

78.00.00.00 Cryptophyllite K2Ca[Si4O10]•5H2O P 2₁/n 2/m

78.00.00.00 IMA2007-041T Na2[Ti4O2(OH)2(SiO4)3]•6H2O R 3m 3m

78.00.00.00 IMA2009-001 Ba5(Ca,REE,Y)22(Ti,Nb)18(SiO4)4[(PO4),(SiO4)]4(BO3)9O22[(OH),F]43(H2O)1.5 R 3 3

78.00.00.00 Iddingsite? MgO.Fe2O3.3SiO2•4(H2O) Ortho

78.00.00.00 Ivanyukite-Cu Cu[Ti4(OH)2O2(SiO4)3]•7H2O P 4 3m 4 3m

78.00.00.00 Ivanyukite-K K2[Ti4(OH)2O2(SiO4)3]•9H2O P 4 3m 4 3m

78.00.00.00 Ivanyukite-Na Na2[Ti4O2(OH)2(SiO4)3]•6H2O P 4 3m 4 3m

78.00.00.00 Plumbophyllite Pb2Si4O10•H2O P bcn 2/m 2/m 2/m

78.00.00.00 Sturtite? (Fe3)(Mn2,Ca,Mg)Si4O10(OH)3•10(H2O) None

Strunz Class:

07.DG.45 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DG -With large and medium sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3

07.DG.45 Chelyabinskite* (Ca,Mg)3Si(OH)6(SO4,CO3)2•9(H2O) Unk Ortho

Other Chelyabinskite Information

References:

PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(37th List of New Min.,Min. Mag.,19)

See Also:

Links to other databases for Chelyabinskite :
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 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Chelyabinskite

(Ca,Mg)3Si(OH)6(SO4,CO3)2•9(H2O)
Dana No: 78.00.00.00 Strunz No: 07.DG.45
Locality:

Notes:

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