mineral
Prehnite
Ca2Al2Si3O10(OH)2
AI-generated identification · may be incorrectHardness of 6-6.5 on the Mohs scale, pale green to yellow-green color, vitreous to pearly luster, and orthorhombic crystal system.
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Physical properties
Hardness of 6-6.5 on the Mohs scale, pale green to yellow-green color, vitreous to pearly luster, and orthorhombic crystal system.
Formation & geological history
Forms as a secondary mineral in mafic igneous rocks, often in cavities and veins through low-grade metamorphism.
Uses & applications
Widely used as a gemstone in jewelry, often cut into cabochons, and prized by mineral collectors.
Geological facts
Prehnite was the first mineral to be named after a military person, Dutch Colonel Hendrik von Prehn.
Field identification & locations
Identified by its distinctive apple-green color and botryoidal crystal habit, commonly found in South Africa and the USA.
