Stishovite Mineral Data

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General Stishovite Information

Chemical Formula:

SiO2

Composition:

Molecular Weight = 60.08 gm

Silicon 46.74 % Si 100.00 % SiO₂

Oxygen 53.26 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

(SiO₂)

Environment:

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

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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

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/mnm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.959(1), 1.53(0.5), 1.981(0.35),

Crystal Structure:

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Ross N L , Shu J F , Hazen R M , Gasparik T , American Mineralogist , 75 (1990) p.739-747, High-pressure crystal chemistry of stishovite, P = 0, but in the diamond cell

View Additional jPOWD Structure files for Stishovite
[1] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [2] [20] [21] [22] [23] [24] [3] [4] [5] [6] [7] [8] [9]

Physical Properties of Stishovite

Color:

Colorless.

Density:

4.35

Diaphaneity:

Transparent

Hardness:

7.5-8

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Stishovite

Gladstone-Dale:

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:

PE_Stishovite= 1.80 barns/electron
U=PE_Stishovite x rElectron Density= 7.70 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Stishovite is Not Radioactive

Stishovite Classification

Dana Class:

04.04.01.09 (04)Simple Oxides

(04.04)with a cation charge of 4+ (A++++ O2)

(04.04.01)Rutile group (Tetragonal: P4/mnm)

04.04.01.01 Rutile TiO2 P 4/mnm 4/m 2/m 2/m

04.04.01.02 Ilmenorutile (Ti,Nb,Fe)O2 P 4/mnm 4/m 2/m 2/m

04.04.01.03 Struverite? (Ti,Ta,Fe)O2 P 4/mnm 4/m 2/m 2/m

04.04.01.04 Pyrolusite MnO2 P 4/mnm 4/m 2/m 2/m

04.04.01.05 Cassiterite SnO2 P 4/mnm 4/m 2/m 2/m

04.04.01.06 Plattnerite PbO2 P 4/mnm 4/m 2/m 2/m

04.04.01.07 Argutite GeO2 P 4/mnm 4/m 2/m 2/m

04.04.01.08 Squawcreekite? (Fe,Sb,W)O4•(H2O) P 4/mnm 4/m 2/m 2/m

04.04.01.09 Stishovite SiO2 P 4/mnm 4/m 2/m 2/m

Strunz Class:

04.DA.40 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.D - Metal:Oxygen = 1:2 and similar

04.DA -With small cations

04.DA.40 Stishovite SiO2 P 4/mnm 4/m 2/m 2/m

Other Stishovite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Print or Cut-and-Paste your Stishovite Specimen Label here :

Stishovite

SiO2
Dana No: 04.04.01.09 Strunz No: 04.DA.40
Locality:

Notes: