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Home Other GeoPicture

Geopicture of the Week: Clinoptilolite

by Tibi Puiu
February 23, 2015
in GeoPicture
A A
Clinoptilolite-Ca
Photo: Volker Betz’s Photo Gallery

Clinoptilolite is a natural zeolite comprising a microporous arrangement of silica and alumina tetrahedra. These zeolite crystals form when volcanic molten lava meets the sea. This chemical reaction creates a crystal with a cage-like, porous structure and negative charge, making it one of the rare, negatively-charged minerals in nature. Engineers have been exploiting this feature, using zeolites as filters for heavy metals which typically have a positive charge. Clinoptilolite, in particular, is a great zeolite for filtration applications. It was even used to cleanup radioactive spills at Chernobyl.

The photo above shows stunning orange crystals of clinoptilotite-Ca on a crust of calcite and clay minerals. The zeolite was mined in Las Palmas Province, Canary Islands, Spain.

Tags: Clinoptilolitezeolite

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