Erionite

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 proper...
Found on http://en.wikipedia.org/wiki/Erionite

erionite

hydrated sodium-potassium-calcium aluminosilicate mineral in the zeolite family, one of the most abundant zeolites present in sedimentary rocks. Its ... [1 related articles]
Found on http://www.britannica.com/eb/a-z/e/41
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