mineral
Prehnite
Calcium aluminum silicate hydroxide, 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 an 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 an orthorhombic crystal system.
Formation & geological history
Forms primarily in hydrothermal veins and cavities of mafic igneous rocks through low-grade metamorphism.
Uses & applications
Widely used as a semi-precious gemstone in jewelry and collected by mineral enthusiasts.
Geological facts
Prehnite was the first mineral to be named after a military governor, Colonel Hendrik von Prehn, in 1788.
Field identification & locations
Identified in the field by its distinct translucent pale green hue and botryoidal habit; commonly found in South Africa and the USA.
