gemstone
Star Garnet
Almandine-Pyrope Garnet with Rutile Inclusions, Fe3Al2(SiO4)3
AI-generated identification · may be incorrectHardness of 6.5 to 7.5 on the Mohs scale, deep red to brownish-red color, vitreous to subadamantine luster, isometric crystal system, and exhibits asterism (four- or six-rayed star effect).
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Physical properties
Hardness of 6.5 to 7.5 on the Mohs scale, deep red to brownish-red color, vitreous to subadamantine luster, isometric crystal system, and exhibits asterism (four- or six-rayed star effect).
Formation & geological history
Formed in metamorphic rocks like schist and gneiss through regional metamorphism, as well as in igneous pegmatites under high temperature and pressure conditions.
Uses & applications
Primarily used as a unique gemstone in jewelry such as rings and pendants, and collected by mineral enthusiasts for its rare optical phenomenon.
Geological facts
Star garnets are exceptionally rare globally, with Idaho and India being the only notable commercial sources in the world.
Field identification & locations
Identified by its distinctive multi-rayed star reflection when illuminated by a single light source, commonly found in alluvial gravel streams near metamorphic terranes.
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