metamorphic
Anyolite
Zoisite with Ruby and Tschermakite (Ca2Al3(SiO4)3(OH) + Al2O3)
Hardness: 6-6.5 (Zoisite) to 9 (Ruby inclusion); Color: Green zoisite with black tschermakite and often red corundum; Luster: Vitreous to pearly; Crystal structure: Orthorhombic (Zoisite); Specific gravity: 3.2-3.5
- Hardness
- 6-6
- Color
- Green zoisite with black tschermakite and often red corundum
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5 (Zoisite) to 9 (Ruby inclusion); Color: Green zoisite with black tschermakite and often red corundum; Luster: Vitreous to pearly; Crystal structure: Orthorhombic (Zoisite); Specific gravity: 3.2-3.5
Formation & geological history
Formed through regional metamorphism of magnesium-rich rocks. Most specimens are from the Anyolite mine in Tanzania, dating back to the Proterozoic era.
Uses & applications
Primarily used as an ornamental stone, for lapidary work like cabochons, carvings, and bead making for jewelry.
Geological facts
The name 'Anyolite' comes from the Maasai word for green ('anyoli'). While usually known for ruby inclusions, this specific specimen shows a sharp contact between the green zoisite and black amphibole (tschermakite).
Field identification & locations
Identify in the field by the distinct bright lime green color paired with black speckles or streaks. Common in Tanzania. Collectors look for high contrast and the presence of red ruby spots.
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