mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
AI-generated identification · may be incorrectHardness of 6-6.5 on Mohs scale, pale green to yellow-green color, vitreous to pearly luster, and orthorhombic crystal system often forming botryoidal aggregates.
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Physical properties
Hardness of 6-6.5 on Mohs scale, pale green to yellow-green color, vitreous to pearly luster, and orthorhombic crystal system often forming botryoidal aggregates.
Formation & geological history
Forms as a secondary mineral in hydrothermal veins and cavities of mafic igneous rocks, particularly basalts.
Uses & applications
Primarily used as a lapidary stone for cabochons, carved ornaments, and appreciated as a collector mineral specimen.
Geological facts
Prehnite was the first mineral to be named after a military person, Colonel Hendrik von Prehn, who discovered it in South Africa.
Field identification & locations
Easily identified by its characteristic apple-green color, botryoidal habit, and distinct cleavage; commonly found in South Africa, Australia, and the US.
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