Cristobalite Mineral Data

Cristobalite Mineral Data
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General Cristobalite Information

Help on Chemical Formula: Chemical Formula: SiO2
Help on Composition: Composition: Molecular Weight = 60.08 gm
   Silicon  46.74 %  Si  100.00 % SiO2
   Oxygen   53.26 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (SiO2)
Help on Environment: Environment: Post-volcanic, magmatic, and secondary.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1887
Help on Locality: Locality: Cerro San Cristobal, Mexico. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Name Pronunciation: Name Pronunciation: Cristobalite + Pronunciation Say CRISTOBALITE
 

Cristobalite Image

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Cristobalite

Comments: White crystals of cristobalite frozen in obsidian glass.
Location: Cerro San Cristobal, Pachuca, Hidalgo, Mexico. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Cristobalite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:1.39167
Help on Cell Dimensions: Cell Dimensions: a = 4.971, c = 6.918, Z = 4; V = 170.95 Den(Calc)= 2.33
Help on Crystal System: Crystal System: Tetragonal - TrapezohedralH-M Symbol (4 2 2) Space Group: P 41212
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.05(1), 2.485(0.2), 2.841(0.13),
Click Here for Large Cristobalite Structure Window Crystal Structure:

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Downs R T , Palmer D C , American Mineralogist , 79 (1994) p.9-14, The pressure behavior of alpha cristobalite, P = room pressure

View Additional jPOWD Structure files for Cristobalite
[1] [10] [11] [12] [13] [14] [15] [16] [17] [18] [2] [3] [4] [5] [6] [7] [8] [9]
 

Physical Properties of Cristobalite

Help on Cleavage: Cleavage: None
Help on Color: Color: Blue gray, Brown, Gray, Yellow, White.
Help on Density: Density: 2.27
Help on Diaphaneity: Diaphaneity: Translucent to transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 6.5 - Pyrite
Help on Luminescence: Luminescence: Fluorescent, Short UV=green red, Long UV=reen red.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Cristobalite

Help on Gladstone-Dale: Gladstone-Dale: 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
Help on Optical Data: Optical Data: Isotropic, n=1.485-1.487.
 

Calculated Properties of Cristobalite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.33 gm/cc
note: Specific Gravity of Cristobalite =2.33 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PECristobalite = 1.80 barns/electron
U=PECristobalite x rElectron Density= 4.18 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cristobalite is Not Radioactive
 

Cristobalite Classification
Help on Dana Class: Dana Class: 75.01.01.01 (75)Tectosilicate Si Tetrahedral Frameworks
  (75.01)SiO2 with [4] coordinated Si
  (75.01.01)Dana Group
 
75.01.01.01 Cristobalite SiO2 P 41212 4 2 2
Help on Strunz Class: Strunz Class: 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
 
04.DA.15 Cristobalite SiO2 P 41212 4 2 2
 

Other Cristobalite Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: 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

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Ask about Cristobalite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

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

Cristobalite

SiO2
Dana No: 75.01.01.01 Strunz No: 04.DA.15
Locality:

 

Notes: