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Cristobalite Mineral Data + |
General Cristobalite Information |
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| 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 Image | |||
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Cristobalite Crystallography |
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| a:c = 1:1.39167 | |||
| a = 4.971, c = 6.918, Z = 4; V = 170.95 Den(Calc)= 2.33 | |||
| Tetragonal - TrapezohedralH-M Symbol (4 2 2) Space Group: P 41212 | |||
| By Intensity(I/Io): 4.05(1), 2.485(0.2), 2.841(0.13), | |||
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Mouse |
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Physical Properties of Cristobalite |
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| 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 | |||
| Non-fluorescent. | |||
| Vitreous (Glassy) | |||
| Nonmagnetic | |||
| white | |||
Optical Properties of Cristobalite |
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| 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 |
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| Isotropic, n=1.485-1.487. | |||
Calculated Properties of Cristobalite |
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relectron=2.33 gm/cc |
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| Fermion Index = 0.02208 Boson Index = 0.97792 |
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PECristobalite = 1.80 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Cristobalite is Not Radioactive |
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Cristobalite Classification |
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| 75.1.1.1 (75)Tectosilicate Si Tetrahedral Frameworks | |||
| (75.1)SiO2 with [4] coordinated Si | |||
| (75.1.1)Dana Group | |||
| IV/D.01-30 IV - Oxides | |||
| IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds) | |||
| IV/D.01 - Quartz group | |||
Other Cristobalite Information |
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| NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65) | |||
| Links to other databases for Cristobalite : 1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Applied Mineralogy 4 -Athena 5 - Crocoite.com Mineral Locations 6 - EUROmin Project 7 - Glendale Community College 8 -Google Images 9 -Google Scholar 10 -Handbook of Mineralogy (MinSocAm) 11 -Handbook of Mineralogy (UofA) 12 -MinDAT 13 -MinMax(Deutsch) 14 -MinMax(English) 15 - Mineral and Gemstone Kingdom 16 -Mineralienatlas (Deutsch) 17 -QUT Mineral Atlas 18 - Scandinavian mineral gallery 19 - UCLA - Petrography Thin-Sections 20 - WWW-MINCRYST 21 -École des Mines de Paris Search for Cristobalite using: Visit our Advertisers for Cristobalite : Translate Cristobalite Mineral Data : Ask about Cristobalite here : Print or Cut-and-Paste your Cristobalite Specimen Label here :
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