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vermiculite

A monoclinic mineral, (Mg,Fe,Al)6(Si,Al)8O20(OH)4.8H2O ; mica group; basal cleavage; soft; pearly; a hydrothermal or weathering alteration of biotite; expands 6 to 20 times by thermal exfoliation; occurs in clay sizes in soils and as crystals and megacrysts in ultramafic rocks; in Montana, North Carolina, South Carolina, Wyoming, Virginia, Colorado, and South Africa.

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  • ed.young
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