mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(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 with botryoidal habits.
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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 with botryoidal habits.
Formation & geological history
Formed in low-grade metamorphic environments, typically as hydrothermal vein fillings in mafic volcanic rocks.
Uses & applications
Used primarily 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 person, military commander Colonel Hendrik von Prehn.
Field identification & locations
Easily identified by its distinctive apple-green botryoidal clusters and characteristic translucent appearance; commonly found in South Africa and Australia.
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Sandstone (with potential mineral staining/concretions)
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Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
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Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
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Granite
Granite (Phaneritic intrusive igneous rock)
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