mineral
Prehnite
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 often forming botryoidal aggregates.
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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 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
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 military officer, Colonel Hendrik von Prehn, who discovered it in South Africa.
Field identification & locations
Identified by its characteristic apple-green color and botryoidal habit; commonly found in South Africa, Australia, and the USA.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous