mineral and metamorphic rock
Amethyst and Ruby in Zoisite
Silicon Dioxide (SiO2) and Anyolite (Zoisite-Hornblende-Ruby mix)
Left: Hardness 7 (Mohs), purple/violet color, vitreous luster, hexagonal crystal system. Right: Hardness 6-9, green (zoisite) and magenta (ruby) colors, dull to vitreous luster, often contains black pargasite inclusions.
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Physical properties
Left: Hardness 7 (Mohs), purple/violet color, vitreous luster, hexagonal crystal system. Right: Hardness 6-9, green (zoisite) and magenta (ruby) colors, dull to vitreous luster, often contains black pargasite inclusions.
Formation & geological history
Amethyst forms in hydrothermal veins and geode cavities. Ruby in Zoisite (Anyolite) is a metamorphic rock formed by the transformation of igneous rocks through heat and pressure, primarily found in Neoproterozoic belts.
Uses & applications
Used widely in semi-precious jewelry, lapidary carvings, metaphysical collecting, and ornamental decorative objects.
Geological facts
Amethyst’s purple color comes from irradiation of iron impurities in quartz. Ruby in Zoisite was first discovered in Tanzania in 1954 and is the only place it is commercially mined.
Field identification & locations
Identify Amethyst by its crystal habit and color zoning. Identify Ruby in Zoisite by its unique green, black, and pink color combination. Found mostly in Brazil/Uruguay (Amethyst) and Tanzania (Ruby Zoisite).
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