Found at sites of meteorite impact, formed by shock metamorphism of quartz at temperatures 1200 deg C and pressures �100 kbar. Quartz, tridymite, cristobalite, and coesite are polym orphs.
IMA Status:
Approved IMA 1962
Locality:
Meteor Crater, Arizona, USA. Link to MinDat.org Location Data.
Name Origin:
Named for Sergei Mikhailovich Stishov, Russian Crystallographer who, with S.V. Popova, first synthesized the compound.
Name Pronunciation:
Stishovite + Pronunciation
Synonym:
ICSD 68409
PDF 45-1374
Stishovite Crystallography
Axial Ratios:
a:c = 1:0.63768
Cell Dimensions:
a = 4.179, c = 2.6649, Z = 2; V = 46.54 Den(Calc)= 4.29
CI meas= 0.102 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= 0.089 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1894,KPDmeas= 0.1868,KC= 0.208 Ncalc = 1.89 - 1.9
Optical Data:
Uniaxial (+), w=1.799, e=1.826, bire=0.0270.
Calculated Properties of Stishovite
Electron Density:
Bulk Density (Electron Density)=4.28 gm/cc note: Specific Gravity of Stishovite =4.29 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PEStishovite = 1.80 barns/electron U=PEStishovite x rElectron Density= 7.70 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Stishovite is Not Radioactive
Chemical Formula: 