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Chelyabinskite

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Formula:
(Ca,Mg)3(SO4,CO3)2[Si(OH)6] · 9H2O (?)
Colour:
White
Lustre:
Silky, Dull
Hardness:
3
Specific Gravity:
1.908 - 1.912
Crystal System:
Orthorhombic
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.


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Classification of ChelyabinskiteHide

Notes:
Rejected by the IMA
Approval History:
Rejected by IMA: 1986
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

Physical Properties of ChelyabinskiteHide

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

Optical Data of ChelyabinskiteHide

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 ChelyabinskiteHide

Formula:
(Ca,Mg)3(SO4,CO3)2[Si(OH)6] · 9H2O (?)

Crystallography of ChelyabinskiteHide

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

Other Language Names for ChelyabinskiteHide

Related Minerals - Nickel-Strunz GroupingHide

7.DG.05DarapskiteNa3(SO4)(NO3) · H2OMon. 2/m
7.DG.10Clinoungemachite(Na, K, Fe, SO4)Mon. 2/m
7.DG.10HumberstoniteNa7K3Mg2(SO4)6(NO3)2 · 6H2OTrig. 3 : R3
7.DG.10UngemachiteK3Na8Fe(SO4)6(NO3)2 · 6H2OTrig. 3 : R3
7.DG.15BentoriteCa6(Cr3+,Al)2(SO4)3(OH)12 · 26H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
7.DG.15CharlesiteCa6(Al,Si)2(SO4)2[B(OH)4](OH,O)12 · 26H2OTrig. 3m : P3 1c
7.DG.15EttringiteCa6Al2(SO4)3(OH)12 · 26H2OTrig. 3m : P3 1c
7.DG.15JouravskiteCa3Mn4+(SO4)(CO3)(OH)6 · 12H2OHex.
7.DG.15SturmaniteCa6(Fe3+,Al,Mn3+)2(SO4)2[B(OH)4](OH)12 · 25H2OTrig. 3m : P3 1c
7.DG.15ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2OHex. 6 : P63
7.DG.15CarraraiteCa3(SO4)[Ge(OH)6](CO3) · 12H2OHex.
7.DG.15BuryatiteCa3(Si,Fe,Al)(SO4)[B(OH)4]O(OH)5 · 12H2O
7.DG.20RapidcreekiteCa2(SO4)(CO3) · 4H2OOrth.
7.DG.20KorkinoiteCa4(SO4)2(CO3)2 · 9(H2O)Orth. mmm (2/m 2/m 2/m) : Pmmm
7.DG.25TatarskiteCa6Mg2(SO4)2(CO3)2(OH)4Cl4 · 7H2OOrth.
7.DG.30NakauriiteCu8(SO4)4(CO3)(OH)6 · 48H2OOrth.
7.DG.35Chessexite(Na,K)4Ca2(Mg,Zn)3Al8(SO4)10(SiO4)2 · 40H2OOrth.
7.DG.40CarlosruiziteK6(Na,K)4Na6Mg10(SeO4)12(IO3)12 · 12H2OTrig. 3m (3 2/m) : P3c1
7.DG.40FuenzalidaiteK6(Na,K)4Na6Mg10(SO4)12(IO3)12 · 12H2OTrig. 3m (3 2/m) : P3c1

Fluorescence of ChelyabinskiteHide

Bluish white fluorescence (UV).

Other InformationHide

Notes:
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 ChelyabinskiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 ChelyabinskiteHide

Localities for ChelyabinskiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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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