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Specific Gravity:
4.30 (Calculated)
Crystal System:
Originally given as "UM2000-61-SiO:". A monoclinic, baddeleyite-like polymorph, or rather polytype, of silica. The unit cell parameters differ from other natural monoclinic SiO2 species, coesite and mogánite. Also differs from synthetic 'Unnamed (Monoclinic Phase-II Cristobalite)'.

Found within wedge-shaped SiO2 grains, 150–900 µm, comprising mosaics of domains, 10–60 µm in diameter. The domains show orthogonal sets of lamellae. Intermixed with stishovite and seifertite.

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Classification of UM2000-61-SiOHide

Unnamed (probably valid)

Physical Properties of UM2000-61-SiOHide

4.30(2) g/cm3 (Calculated)

Chemical Properties of UM2000-61-SiOHide


Crystallography of UM2000-61-SiOHide

Crystal System:
Cell Parameters:
a = 4.375(1) Å, b = 4.584(1) Å, c = 4.708(1) Å
β = 99.97(3)°
a:b:c = 0.954 : 1 : 1.027
Unit Cell V:
92.99 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:

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 UM2000-61-SiOHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
El Goresy, A., Dubrovinsky, L., Sharp, T.G., Saxena, S.K., Chen, M. (2000): A monoclinic post-stishovite polymorph of silica in the Shergotty meteorite. Science, 288: 1632–1634; in: Jambor, J.L., Kovalenker, V.A., Roberts, A.C. (2001): New mineral names. Am. Min.: 86: 378.
Smith, D.G.W., Nickel, E.H. (2007): A System of Codification for Unnamed Minerals: Report of the SubCommittee for Unnamed Minerals of the IMA Commission on New Minerals, Nomenclature and Classification (2012 Update). Canadian Mineralogist: 45: 983-1055; http://nrmima.nrm.se (2016) (Update: 2012-017)

Internet Links for UM2000-61-SiOHide

Localities for UM2000-61-SiOHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
  • Bihar
    • Gaya District
El Goresy, A., Dubrovinsky, L., Sharp, T.G., Saxena, S.K., Chen, M. (2000): A monoclinic post-stishovite polymorph of silica in the Shergotty meteorite. Science, 288: 1632–1634; in: Jambor, J.L., Roberts, A.C. (2000): New mineral names. Am. Min.: 96: 941.
Mineral and/or Locality  
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