Minerals identify

Know how to recognize them

Vermiculite

Phyllosilicates

Vermiculite is a hydrous phyllosilicate which undergoes significant expansion when heated. Exfoliation occurs when the mineral is heated sufficiently, and commercial furnaces can routinely produce this effect. Vermiculite forms by the weathering or hydrothermal alteration or phlogopite Large commercial vermiculite mines currently exist in the United States of America, China.

Identification

Color of mineral

White
Yellow
Green
Brown
Black

Mohs scale ( mineral hardness )

1.5

The streak

Brown
Yellow
Green

Density ( specific gravity )

1.525
1.545
1.545

Luster ( interacts light )

Greasy
Vitreous

Crystal ( diaphaneity )

Monoclinic