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Chemical substitution in silica polymorphIon and electron probe analyses are presented for trace elements (Al, Na, K, Li, Ti) in quartz, tridymite, cristobalite and melanophlogite. Quartz and melanophlogite show low levels of trace elements relative to tridymite and cristobalite. The previously determined alpha-beta inversion temperature decreases as the Al content of quartz increases. For all silica polymorphs, Al is greater than or equal to Na + K + Li on an atom basis, with the excess Al probably balanced by H.
Document ID
19840061696
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Smith, J. V.
(Chicago Univ. Chicago, IL, United States)
Steele, I. M.
(Chicago, University Chicago, IL, United States)
Date Acquired
August 12, 2013
Publication Date
March 1, 1984
Publication Information
Publication: Neues Jahrbuch fuer Mineralogie, Monatshefte
ISSN: 0028-3649
Subject Category
Inorganic And Physical Chemistry
Accession Number
84A44483
Funding Number(s)
CONTRACT_GRANT: NSF EAR-82-06191
CONTRACT_GRANT: NSF DMR-79-24007
CONTRACT_GRANT: NGL-14-001-171
Distribution Limits
Public
Copyright
Other

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