Abstract

Heavy-mineral separates from 51 montmorillonitic clays indicate that primary bentonites contain biotite, zircon, apatite, and sometimes titanite. Secondary, redeposited bentonites and montmorillonitic clays not of volcanic origin commonly contain such minerals as tourmaline, garnet, and muscovite.

First Page Preview

First page PDF preview
You do not currently have access to this article.