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Ewingite

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About EwingiteHide

Formula:
Mg8Ca8(UO2)24(CO3)30O4(OH)12(H2O)138
Crystal System:
Tetragonal
New structure type. Chemically resembles rabbittite, swartzite, and albrechtschraufite.


Classification of EwingiteHide

Approved
Approval Year:
2016
First Published:
2017

Chemical Properties of EwingiteHide

Formula:
Mg8Ca8(UO2)24(CO3)30O4(OH)12(H2O)138
IMA Formula:
Mg8Ca8(UO2)24(CO3)30O4(OH)12(H2O)138

Crystallography of EwingiteHide

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
I41/acd
Setting:
I41/acd
Cell Parameters:
a = 35.401(9) Å, c = 48.157(13) Å
Ratio:
a:c = 1 : 1.36
Unit Cell V:
60,351.84 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
17.8(19)
14.3(31)
10.1(74)
8.28(100)
6.61(24)
6.03(30)
5.69(36)
3.772(17)
Comments:
From Type Description.

Type Occurrence of EwingiteHide

Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue number 65686

Synonyms of EwingiteHide

Other InformationHide

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 EwingiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Olds, T.A., Plášil, J., Kampf, A.R., Burns, P.C., Simonetti, A. and Sadergaski, L.R. (2016) Ewingite, IMA 2016-012. CNMNC Newsletter No. 31, June 2016, page 697; Mineralogical Magazine, 80, 691–697.
Olds, T. A., Plášil, J., Kampf, A. R., Simonetti, A., Sadergaski, L. R., Chen, Y.-S. and Burns, P. C. (2017) Ewingite: Earth’s most complex mineral. Geology, 45, 11, 1007–1010.

Internet Links for EwingiteHide

Localities for EwingiteHide

ⓘ - 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.
Czech Republic (TL)
 
  • Karlovy Vary Region
    • Krušné Hory Mts (Erzgebirge)
      • Jáchymov District (St Joachimsthal)
Olds, T.A., Plášil, J., Kampf, A.R., Burns, P.C., Simonetti, A. and Sadergaski, L.R. (2016) Ewingite, IMA 2016-012. CNMNC Newsletter No. 31, June 2016, page 697; Mineralogical Magazine, 80, 691–697.
Mineral and/or Locality  
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