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β-Cristobalite

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Formula:
SiO2
Colour:
colorless, white
Lustre:
Vitreous
Crystal System:
Isometric
Name:
Named after its locality (Cerro San Cristobal, Mexico).
The cubic high-temperature polymorph of cristobalite, stable at temperatures above 1470°C (the transition is slow and the transition temperature difficult to determine; for a review see Heaney, 1994).
Found in volcanic environments. Specimens in collections are paramorphs of tetragonal α-cristobalite after β-cristobalite.



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Physical Properties of β-CristobaliteHide

Vitreous
Transparency:
Transparent
Colour:
colorless, white

Chemical Properties of β-CristobaliteHide

Formula:
SiO2

Crystallography of β-CristobaliteHide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3m
Cell Parameters:
a = 4.96937 Å, c = 6.92563 Å
Ratio:
a:c = 1 : 1.394
Unit Cell V:
171.026 ų
Morphology:
Pseudo octahedral crystals, commonly dendritic, spherulites.
Twinning:
Spinel law twinning (1 1 1) is common

Epitaxial Relationships of β-CristobaliteHide

Epitaxial Minerals:

Synonyms of β-CristobaliteHide

Common AssociatesHide

SanidineK(AlSi3O8)
TridymiteSiO2

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for β-CristobaliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
vom Rath, G. (1887) Ueber Cristobalit vom Cerro S. Cristóbal bei Pachuca (Mexico). Neues Jahrbuch für Mineralogie, Geologie und Paläontologie: 1987: 198-199.
Heaney, P.J. (1994) Structure and chemistry of the low-pressure silica polymorphs. In: Reviews in Mineralogy, Volume 29, Silica - Physical behavior, geochemistry and materials applications. Mineralogical Society of America, Washington, D.C.

Internet Links for β-CristobaliteHide

Mineral and/or Locality  
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