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UM2000-61-SiO

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Formula:
SiO2
Specific Gravity:
4.30 (Calculated)
Crystal System:
Monoclinic
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

Notes:
Unnamed (probably valid)

Physical Properties of UM2000-61-SiOHide

Density:
4.30(2) g/cm3 (Calculated)

Chemical Properties of UM2000-61-SiOHide

Formula:
SiO2

Crystallography of UM2000-61-SiOHide

Crystal System:
Monoclinic
Cell Parameters:
a = 4.375(1) Å, b = 4.584(1) Å, c = 4.708(1) Å
β = 99.97(3)°
Ratio:
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:
d-spacingIntensity
3.260Å(22)
2.767Å(100)
2.459Å(31)
1.950Å(26)
1.629Å(24)

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.
India
 
  • 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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