Quartz after Tridymite in an Acid Intrusion from Mull

R. R. Skelhorn1
King's College, London, W.C. 2.
1Present address: Sir John Cass College, London, E.C. 3.

Summary: The occurrence of tridymite, now inverted to quartz, in a craignurite (allied to granophyre) from Craignure, Mull, is described. An account of the field occurrence and petrology and a new analysis of the craignurite are given. The significance of the occurrence of tridymite is discussed in the light of recent experimental studies.

Mineralogical Magazine; June 1962 v. 33; no. 257; p. 138-144; DOI: 10.1180/minmag.1962.033.257.07
© 1962, The Mineralogical Society
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