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Chelyabinskite

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Formula:
(Ca,Mg)3(SO4,CO3)2[Si(OH)6] · 9H2O (?)
System:
Orthorhombic
Colour:
White
Lustre:
Silky, Dull
Hardness:
3
Name:
After the area of occurrence, the Chelyabinsk coal basin, Urals Region, Russia.
A substance of anthropogenic origin (burning coal mine dumps). Current IMA regulations do not allow such substances to be validated as mineral species.

A questionable mineral, possessing many properties and values of, and possibly identical to Thaumasite.

Originally reported from Chelyabinsk coal basin, Chelyabinsk Oblast', Urals Region, Russia.

Classification of Chelyabinskite

Rejected 1986
Explanation of status:
Anthropogenic origin.
7.DG.45

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
G : With large and medium-sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3
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http://www.mindat.org/min-6864.html
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Physical Properties of Chelyabinskite

Silky, Dull
Diaphaneity (Transparency):
Opaque
Colour:
White
Hardness (Mohs):
3
Density:
1.908 - 1.912 g/cm3 (Measured)    1.938 g/cm3 (Calculated)

Crystallography of Chelyabinskite

Crystal System:
Orthorhombic
Cell Parameters:
a = 19.01Å, b = 20.93Å, c = 22.45Å
Ratio:
a:b:c = 0.908 : 1 : 1.073
Unit Cell Volume:
V 8,932.39 ų (Calculated from Unit Cell)
Z:
18

Optical Data of Chelyabinskite

Type:
Biaxial
RI values:
nα = 1.475 nβ = 1.495 nγ = 1.508
2V:
Measured: 77° , Calculated: 76°
Max Birefringence:
δ = 0.033
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none

Chemical Properties of Chelyabinskite

Formula:
(Ca,Mg)3(SO4,CO3)2[Si(OH)6] · 9H2O (?)
Essential elements:
All elements listed in formula:

Relationship of Chelyabinskite to other Species

7.DG.05DarapskiteNa3(SO4)(NO3) · H2O
7.DG.10Clinoungemachite(Na, K, Fe, SO4)
7.DG.10HumberstoniteNa7K3Mg2(SO4)6(NO3)2 · 6H2O
7.DG.10UngemachiteK3Na8Fe(SO4)6(NO3)2 · 6H2O
7.DG.15BentoriteCa6(Cr3+,Al)2(SO4)3(OH)12 · 26H2O
7.DG.15CharlesiteCa6(Al,Si)2(SO4)2[B(OH)4](OH,O)12 · 26H2O
7.DG.15EttringiteCa6Al2(SO4)3(OH)12 · 26H2O
7.DG.15JouravskiteCa3Mn4+(SO4}(CO3)(OH)6 · 12H2O
7.DG.15SturmaniteCa6(Fe3+,Al,Mn3+)2(SO4)2[B(OH)4](OH)12 · 25H2O
7.DG.15ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2O
7.DG.15CarraraiteCa3(SO4)[Ge(OH)6](CO3) · 12H2O
7.DG.15BuryatiteCa3(Si,Fe,Al)(SO4)[B(OH)4]O(OH)5 · 12H2O
7.DG.20RapidcreekiteCa2(SO4)(CO3) · 4H2O
7.DG.20KorkinoiteCa4(SO4)2(CO3)2 · 9(H2O)
7.DG.25TatarskiteCa6Mg2(SO4)2(CO3)2(OH)4Cl4 · 7H2O
7.DG.30NakauriiteCu8(SO4)4(CO3)(OH)6 · 48H2O
7.DG.35Chessexite(Na,K)4Ca2(Mg,Zn)3Al8(SO4)10(SiO4)2 · 40H2O
7.DG.40CarlosruiziteK6(Na,K)4Na6Mg10(SeO4)12(IO3)12 · 12H2O
7.DG.40FuenzalidaiteK6(Na,K)4Na6Mg10(SO4)12(IO3)12 · 12H2O

Other Names for Chelyabinskite

Name in Other Languages:

Other Information

Bluish white fluorescence (UV).
Other Information:
Boils intensely in HCl, leaving a siliceous residue.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Chelyabinskite

Reference List:
Chesnokov, B.V., L.F. Bazhenova, E.P. Shcherbakova, T.A. Michal, T.N. Deriabina (1988) New minerals from the burned dumps of the Chelyabinsk coal basin. In Mineralogy, technogenesis, and mineral-resource complexes of the urals, 5-31. Akad. Nauk SSSR-Uralskoe Otdel. (in Russian).

Jambor, John L. and Puziewicz, Jacek (1993) New Mineral Names. American Mineralogist: 78: 1108-1112.

Cesnokov, B., Kotrly, M. and Nisanbajev, T. (1998): Brennende Abraumhalden und Aufschlüsse im Tscheljabinsker Kohlenbecken - eine reiche Mineralienküche. Mineralien-Welt, 9 (3), 54-63 (in German).

Internet Links for Chelyabinskite

Localities for Chelyabinskite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Russia
 
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
Mineralogical Magazine 60:527
Cesnokov, B., M. Kotrly, and T. Nisanbajev (1998): Brennende Abraumhalden und Aufschlüsse im Tscheljabinsker Kohlenbecken - eine reiche Mineralienküche. Mineralien-Welt, 9 (3), 54-63 (in German).
Igor Pekov (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Mineral and/or Locality  
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