metamorphic
Zoisite with Ruby
Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)
Hardness: 6-7 (Zoisite) to 9 (Ruby); Color: Green with black specks and sometimes red; Luster: Vitreous; Crystal Structure: Orthorhombic/Trigonal; Specific Gravity: 3.3
- Hardness
- 6-7 (Zoisite) to 9 (Ruby)
- Color
- Green with black specks and sometimes red
- Luster
- Vitreous
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Physical properties
Hardness: 6-7 (Zoisite) to 9 (Ruby); Color: Green with black specks and sometimes red; Luster: Vitreous; Crystal Structure: Orthorhombic/Trigonal; Specific Gravity: 3.3
Formation & geological history
Formed by regional metamorphism of igneous or sedimentary rocks containing aluminum and calcium. Typically associated with metamorphic rocks of Proterozoic age.
Uses & applications
Used primarily as an ornamental stone, for carvings, cabochons, and in the jewelry industry for beads and pendants.
Geological facts
Anyolite was first discovered in Tanzania in 1954. The name comes from the Maasai word 'anyoli', meaning green. It is unique for containing large, non-gem grade ruby crystals within a green zoisite matrix.
Field identification & locations
Identify by the distinct mottled green base with black hornblend inclusions and occasional magenta/red ruby spots. Common in Tanzania.
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