Minerals identify

Know how to recognize them

Erionite

Zeolite

Erionite is a naturally occurring fibrous mineral that belongs to a group of minerals called zeolites. It usually is found in volcanic ash that has been altered by weathering and ground water. Erionite forms brittle, wool-like fibrous masses in the hollows of rock formations and has an internal molecular structure similar to chabazite. Some properties of erionite are similar to the properties of asbestos; however, erionite is not currently regulated by the U.S. Environmental Protection Agency and there are no occupational exposure limits for erionite fibers. Erionite was first described by A.S. Eakle in 1898, as white woolly fibrous masses in cavities in rhyolite lava near Durkee, Oregon. It was originally thought to be another relatively rare zeolite named offretite , which is very similar to erionite in appearance and chemical composition.

Identification

Color of mineral

White
Green
Grey
Orange

Mohs scale ( mineral hardness )

3.5
4

The streak

White

Density ( specific gravity )

1.4711
1.474

Luster ( interacts light )

Silky
Vitreous

Crystal ( diaphaneity )

Hexagonal