Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on Mindat
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralSearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

β-Cristobalite

This page is currently not sponsored. Click here to sponsor this page.
Formula:
SiO2
System:
Isometric
Colour:
colorless, white
Lustre:
Vitreous
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.



Classification of β-Cristobalite

Physical Properties of β-Cristobalite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
colorless, white

Chemical Properties of β-Cristobalite

Formula:
SiO2
Elements listed in formula:

Crystallography of β-Cristobalite

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 Volume:
V 171.026 ų
Morphology:
Pseudo octahedral crystals, commonly dendritic, spherulites.
Twinning:
Spinel law twinning (1 1 1) is common

Epitaxial Relationships of β-Cristobalite

Epitaxial Minerals:

Relationship of β-Cristobalite to other Species

Common Associates:

Other Names for β-Cristobalite

Name in Other Languages:

Other Information

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-Cristobalite

Reference List:
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-Cristobalite

mindat.org URL:
https://www.mindat.org/min-5161.html
Please feel free to link to this page.
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2017, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: September 22, 2017 03:50:45 Page generated: June 25, 2017 07:37:04
Go to top of page