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A purple-colored 1M mica clay from Silverton, Colorado

Clays and Clay Minerals

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Abstract

A purple-colored clay of 1M mica polymorph in association with lead-zinc ore was collected from an abandoned mine dump near Silverton, Colorado. Electron micrographs show that the crystallites of the clay are less than 2?? in size and have poorly developed hexagonal outlines. Differential thermal and i.r. absorption analyses indicate similarity with those of muscovite. The structural formula of the 1M mica polymorph is (K1??45Na0??02) (Al3??75Mg0??19) (Si6??90Al1??10) O20(OH)4. The purple color may be related to trace amounts of manganese in the clay. ?? 1969.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
A purple-colored 1M mica clay from Silverton, Colorado
Series title:
Clays and Clay Minerals
Volume
17
Issue:
4
Year Published:
1969
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article