metamorphic
Ruby in Zoisite
Anyolite (Green Zoisite with Corundum)
Hardness: 6-6.5 (Zoisite) to 9 (Ruby/Corundum); Color: Mottled green, magenta, and often black spots; Luster: Vitreous to dull; Crystal structure: Orthorhombic/Hexagonal; Specific Gravity: 3.3-3.5
- Hardness
- 6-6
- Color
- Mottled green, magenta, and often black spots
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-6.5 (Zoisite) to 9 (Ruby/Corundum); Color: Mottled green, magenta, and often black spots; Luster: Vitreous to dull; Crystal structure: Orthorhombic/Hexagonal; Specific Gravity: 3.3-3.5
Formation & geological history
Formed through the regional metamorphism of magnesium-rich rocks, specifically within the Mundarara Mine area of Tanzania. It is approximately 500-600 million years old (Neoproterozoic).
Uses & applications
Primarily used for lapidary work, including cabochons, carvings (especially figurines), beads for jewelry, and as a popular collector specimen.
Geological facts
Also known as Anyolite, which translates to 'green' in the Maasai language. It was discovered in 1954 in Tanzania, which remains the only significant source of this unique combination.
Field identification & locations
Identify by the distinct contrast of magenta ruby crystals embedded in a forest-green zoisite matrix, often with black hornblende inclusions. It is exclusively found in Tanzania.
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