metamorphic
Zoisite with Ruby / Anyolite
Anyolite (Ca2Al3(SiO4)3(OH) with Chromian Zoisite and Tschermakite inclusions)
Hardness: 6-7 (Zoisite) and 9 (Ruby); Color: Bright lime green with black spots; Luster: Vitreous to pearly; Crystal structure: Orthorhombic; Specific gravity: 3.2-3.5
- Hardness
- 6-7 (Zoisite) and 9 (Ruby)
- Color
- Bright lime green with black spots
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-7 (Zoisite) and 9 (Ruby); Color: Bright lime green with black spots; Luster: Vitreous to pearly; Crystal structure: Orthorhombic; Specific gravity: 3.2-3.5
Formation & geological history
Formed through the regional metamorphism of calcium-rich rocks. Most specimens are from the Neoproterozoic era, approximately 500-800 million years old.
Uses & applications
Predominantly used for ornamental carvings, cabochons for jewelry, and as a popular display stone for mineral collectors.
Geological facts
The name 'Anyolite' is derived from the Maasai word 'anyoli', meaning green. While it often contains inclusions of ruby, the ruby is usually opaque and not of gemstone quality.
Field identification & locations
Identified by its distinctive contrast of vibrant green zoisite and black tschermakite hornblende spots. Found almost exclusively in the Longido mining district of Tanzania. Collectors look for a balance of vibrant color and distinct spotting.
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