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Chemical substitution in silica polymorph (1984)

Smith, J. V. ; Steele, I. M.

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Publication Date: 2019-06-28

Description: Ion 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.

Keywords: INORGANIC AND PHYSICAL CHEMISTRY

Type: Neues Jahrbuch fuer Mineralogie, Monatshefte (ISSN 0028-3649); 137-144

Format: text

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