gemstone
Ametrine
Quartz (Silicon Dioxide, SiO2)
Hardness of 7 on the Mohs scale, vitreous luster, hexagonal crystal system, conchoidal fracture, no distinct cleavage, specific gravity of 2.65. Distinct bi-color zones of purple (amethyst) and yellow/orange (citrine).
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Physical properties
Hardness of 7 on the Mohs scale, vitreous luster, hexagonal crystal system, conchoidal fracture, no distinct cleavage, specific gravity of 2.65. Distinct bi-color zones of purple (amethyst) and yellow/orange (citrine).
Formation & geological history
Formed in hydrothermal veins, typically within granitic pegmatites or metamorphic rocks, where different oxidation states of iron and natural irradiation create the zoned coloration over millions of years.
Uses & applications
Used primarily in jewelry as a faceted gemstone, decorative carvings, and as a collector's mineral specimen.
Geological facts
Ametrine is a natural variety of quartz that combines amethyst and citrine in a single crystal. The vast majority of the world's commercial ametrine comes from a single mine in Bolivia (the Anahi Mine).
Field identification & locations
Identified by its dual purple and yellow-orange coloration within the same crystal matrix. Commonly found in Bolivia and Brazil.
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