gemstone
Ametrine
Silicon dioxide, SiO2
AI-generated identification · may be incorrectHardness 7 on Mohs scale, zoned purple and yellow color, vitreous luster, trigonal crystal system, conchoidal fracture.
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Physical properties
Hardness 7 on Mohs scale, zoned purple and yellow color, vitreous luster, trigonal crystal system, conchoidal fracture.
Formation & geological history
Formed in hydrothermal veins at low temperatures where differing oxidation states of iron create zoned quartz crystals.
Uses & applications
Used primarily as a cut gemstone in jewelry and prized by mineral collectors for its bi-color aesthetic.
Geological facts
Also known as tristine or bolivianite, natural ametrine is mined almost exclusively in Bolivia.
Field identification & locations
Identified by the distinct natural zones of amethyst purple and citrine yellow within a single quartz crystal.
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