![]() |
Cristobalite Mineral Data |
General Cristobalite Information |
|||
![]() |
SiO2 | ||
![]() |
Molecular Weight = 60.08 gm | ||
Silicon 46.74 % Si 100.00 % SiO2 | |||
Oxygen 53.26 % O | |||
______ ______ | |||
100.00 % 100.00 % = TOTAL OXIDE | |||
![]() |
(SiO2) | ||
![]() |
Post-volcanic, magmatic, and secondary. | ||
![]() |
Valid Species (Pre-IMA) 1887 | ||
![]() |
Cerro San Cristobal, Mexico. Link to MinDat.org Location Data. | ||
![]() |
Named after its locality. | ||
![]() |
Cristobalite + Pronunciation ![]() |
||
Cristobalite Image | |||
![]() |
|
||
Cristobalite Crystallography |
|||
![]() |
a:c = 1:1.39167 | ||
![]() |
a = 4.971, c = 6.918, Z = 4; V = 170.95 Den(Calc)= 2.33 | ||
![]() |
Tetragonal - Trapezohedral H-M Symbol (4 2 2) Space Group: P 41212 | ||
![]() |
By Intensity(I/Io): 4.05(1), 2.485(0.2), 2.841(0.13), | ||
Physical Properties of Cristobalite |
|||
![]() |
None | ||
![]() |
Blue gray, Brown, Gray, Yellow, White. | ||
![]() |
2.27 | ||
![]() |
Translucent to transparent | ||
![]() |
Brittle - Generally displayed by glasses and most non-metallic minerals. | ||
![]() |
Crystalline - Fine - Occurs as well-formed fine sized crystals. | ||
![]() |
Spherical - Spherical, rounded aggregates. | ||
![]() |
6.5 - Pyrite | ||
![]() |
Fluorescent, Short UV=green red, Long UV=reen red. | ||
![]() |
Vitreous (Glassy) | ||
![]() |
Nonmagnetic | ||
![]() |
white | ||
Optical Properties of Cristobalite |
|||
![]() |
CI meas= -0.03 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= -0.004 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2088,KPDmeas= 0.2143,KC= 0.208 Ncalc = 1.47 - 1.48 |
||
![]() |
Isotropic, n=1.485-1.487. | ||
Calculated Properties of Cristobalite |
|||
![]() |
Bulk Density (Electron Density)=2.33 gm/cc note: Specific Gravity of Cristobalite =2.33 gm/cc. |
||
![]() |
Fermion Index = 0.02 Boson Index = 0.98 |
||
![]() |
PECristobalite = 1.80 barns/electron U=PECristobalite x rElectron Density= 4.18 barns/cc. |
||
![]() |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Cristobalite is Not Radioactive |
||
Cristobalite Classification |
|||
![]() |
75.01.01.01 (75)Tectosilicate Si Tetrahedral Frameworks | ||
(75.01)SiO2 with [4] coordinated Si | |||
(75.01.01)Dana Group | |||
![]() |
04.DA.15 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 | |||
Other Cristobalite Information |
|||
![]() |
NAME( Duda&Rejl90) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Heinrich65) | ||
![]() |
Links to other databases for Cristobalite : 1 - Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Athena 4 - EUROmin Project 5 - Ecole des Mines de Paris 6 - GeoScienceWorld 7 - Glendale Community College 8 - Google Images 9 - Google Scholar 10 - Handbook of Mineralogy (MinSocAm) 11 - Handbook of Mineralogy (UofA) 12 - MinDAT 13 - Mineral and Gemstone Kingdom 14 - Mineralienatlas (Deutsch) 15 - Online Mineral Museum 16 - QUT Mineral Atlas 17 - Ruff.Info 18 - Scandinavian mineral gallery 19 - UCLA - Petrography Thin-Sections 20 - WWW-MINCRYST Search for Cristobalite using: Visit our Advertisers for Cristobalite : Ask about Cristobalite here : Print or Cut-and-Paste your Cristobalite Specimen Label here :
|
||
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.