metamorphic
Ruby in Zoisite
Zoisite with Corundum (Ca2Al3(SiO4)(Si2O7)O(OH) + Al2O3)
Hardness: 6-9 (Zoisite 6.5, Ruby 9), Color: Green with pinkish-red spots, Luster: Vitreous to pearly, Crystal Structure: Orthorhombic (Zoisite) and Hexagonal (Ruby)
- Hardness
- 6-9 (Zoisite 6
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Physical properties
Hardness: 6-9 (Zoisite 6.5, Ruby 9), Color: Green with pinkish-red spots, Luster: Vitreous to pearly, Crystal Structure: Orthorhombic (Zoisite) and Hexagonal (Ruby)
Formation & geological history
Formed during the regional metamorphism of igneous or sedimentary rocks containing calcium and aluminum. High pressure and temperature conditions allow the zoisite and ruby to crystallize together.
Uses & applications
Primarily used for ornamental carvings, cabochons for jewelry, and as a popular specimen for gemstone collectors and metaphysical enthusiasts.
Geological facts
Also known as Anyolite, derived from the Maasai word 'anyoli' meaning green. Large rubies found in this matrix are often opaque and unsuitable for high-end faceted jewelry but beautiful as a combination stone.
Field identification & locations
Identified by the distinct contrast between the green zoisite matrix and pink/red ruby inclusions. Found almost exclusively in Tanzania. Collectors look for high ruby-to-zoisite ratios for higher value.
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