metamorphic
Zoisite with Ruby
Anyolite (Ca2Al3(SiO4)3(OH) with Al2O3:Cr)
Hardness: 6-7 (Zoisite) to 9 (Ruby); Color: Green with magenta/pink inclusions and black spots; Luster: Vitreous to dull; Crystal Structure: Orthorhombic (Zoisite) and Trigonal (Ruby); Specific Gravity: 3.35.
- Hardness
- 6-7 (Zoisite) to 9 (Ruby)
- Color
- Green with magenta/pink inclusions and black spots
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Zoisite) to 9 (Ruby); Color: Green with magenta/pink inclusions and black spots; Luster: Vitreous to dull; Crystal Structure: Orthorhombic (Zoisite) and Trigonal (Ruby); Specific Gravity: 3.35.
Formation & geological history
Formed through the regional metamorphism of calcium-rich rocks. Most specimens are from the Neoproterozoic Era (approx. 600 million years ago) and occur in metamorphic schists.
Uses & applications
Primarily used as an ornamental stone for carvings, cabochons for jewelry, and as a popular specimen for crystal healing and mineral collectors.
Geological facts
The name 'Anyolite' comes from the Maasai word 'anyoli', meaning green. While it contains ruby, the ruby is usually opaque and not of gemstone quality.
Field identification & locations
Identify by its distinctive combination of bright green zoisite and pinkish-red corundum (ruby), often accompanied by black pargasite spots. Found almost exclusively in Tanzania.
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