Abstract
Reexamination of a "nontronitic" smectite from Mount Megantic indicates that it consists largely of a ferruginous (Fe3+ greater than Fe2+) smectite-like mineral with a small amount of a vermiculite-like mineral. The major component has a high substitution of Si by Al in the tetrahedral sheet and an excess charge in the octahedral sheet, as indicated by the overall chemical formula[Formula: see text]In many aspects, this mineral resembles so-called "cardenite." Key words: Di-trioctahedral minerals, gabbro saprolite, smectite, vermiculite
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