metamorphic
Ruby in Zoisite with Hornblende
Anyolite (Ruby: Al2O3, Zoisite: Ca2Al3(SiO4)3(OH))
Hardness: 6-9 (Zoisite 6.5, Ruby 9); Color: Red (Ruby), Green (Zoisite), Black (Hornblende); Luster: Vitreous; Crystal Structure: Trigonal/Orthorhombic; Specific Gravity: 3.35
- Hardness
- 6-9 (Zoisite 6
- Color
- Red (Ruby), Green (Zoisite), Black (Hornblende)
- Luster
- Vitreous
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Physical properties
Hardness: 6-9 (Zoisite 6.5, Ruby 9); Color: Red (Ruby), Green (Zoisite), Black (Hornblende); Luster: Vitreous; Crystal Structure: Trigonal/Orthorhombic; Specific Gravity: 3.35
Formation & geological history
Formed through the regional metamorphism of mafic rocks. The presence of chromium gives the rubies their red color. It is typically found in Precambrian metamorphic terrains.
Uses & applications
Used primarily as an ornamental stone for carvings, spheres, cabochons, and beads in jewelry. It is highly valued for its striking color contrast.
Geological facts
This rock was first discovered in the Longido mining district in northeast Tanzania in 1954. It is the only location in the world where this specific combination of minerals is found in large quantities.
Field identification & locations
Identify by its distinctive tricolor scheme: green zoisite, red ruby (often hexagonal or squarish), and black hornblende inclusions. It does not possess the transparency of gem-grade ruby and zoisite.
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