Chelyabinskite Mineral Data

Chelyabinskite Mineral Data

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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.

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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:

OrthorhombicSpace 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

Diaphaniety:

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

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:

r_electron=2.00 gm/cc
note: r_{Chelyabinskite}=1.92 gm/cc.

Fermion Index

Fermion Index = 0.00671
Boson Index = 0.99329

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Chelyabinskite is Not Radioactive

Chelyabinskite Classification

Dana Class:

78.0.0.0 (78)Unclassified Silicate Minerals

(78.0)Without Dana Classification Numbers

(Unclassified Silicate)

Strunz Class:

VIII/B.22-100 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12]

VIII/B.22 - Thaumasite series

VIII/B.22-10 Hatrurite Ca3SiO5 R 3m 3m

VIII/B.22-25 Poldervaartite (Ca,Mn)2SiO3(OH)2 P bca 2/m 2/m 2/m

VIII/B.22-30 Afwillite Ca3Si2O4(OH)6 P 2₁ 2

VIII/B.22-40 Bultfonteinite Ca2SiO2(OH,F)4 P1 1

VIII/B.22-50 Spurrite Ca5(SiO4)2(CO3) P 2₁/a 2/m

VIII/B.22-60 Paraspurrite Ca5(SiO4)2(CO3) P 2₁/a 2/m

VIII/B.22-65 Ternesite! Ca5(SiO4)2SO4 P nma 2/m 2/m 2/m

VIII/B.22-70 Nagelschmidtite Ca7(SiO4)3(PO4)2 Unk Hex

VIII/B.22-75 Harrisonite! Ca(Fe,Mg)6(PO4)2(SiO4)2 R 3m 3 2/m

VIII/B.22-80 Fukalite Ca4Si2O6(CO3)(OH,F)2 Unk Ortho

VIII/B.22-90 Thaumasite Ca3Si(CO3)(SO4)(OH)6·12(H2O) P 6₃/m 6/m

VIII/B.22-100 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 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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Chelyabinskite

(Ca,Mg)3Si(OH)6(SO4,CO3)2·9(H2O)
Dana No: Unknown Strunz No: VIII/B.22-100
Locality:

Notes: