metamorphic
Ruby in Zoisite
Anyolite (Zoisite with Corundum and Tschermakite/Pargasite)
Hardness: 6-6.5 (Zoisite matrix) to 9 (Ruby/Corundum). Color: Bright green, magenta/red-pink, and black. Luster: Vitreous to pearly. Crystal Structure: Orthorhombic (Zoisite), Trigonal (Ruby). Cleavage: Perfect on {010} for zoisite. Specific Gravity: 3.10-3.35.
- Hardness
- 6-6
- Color
- Bright green, magenta/red-pink, and black
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5 (Zoisite matrix) to 9 (Ruby/Corundum). Color: Bright green, magenta/red-pink, and black. Luster: Vitreous to pearly. Crystal Structure: Orthorhombic (Zoisite), Trigonal (Ruby). Cleavage: Perfect on {010} for zoisite. Specific Gravity: 3.10-3.35.
Formation & geological history
Formed through regional metamorphism of magnesium-rich rocks. Anyolite was formed during mountain-building tectonic events, primarily located in Precambrian geological formations.
Uses & applications
Popular as an ornamental stone, used for lapidary carvings, cabochons, tumbled stones, and gemstone jewelry. Also highly valued by crystal collectors.
Geological facts
Also known as Anyolite, a name derived from the Maasai word 'anyoli', meaning 'green'. It was first discovered in 1954 at the Longido mine in Tanzania.
Field identification & locations
Identified by its distinctive combination of green zoisite matrix, pink-to-red ruby (corundum) inclusions, and black tschermakite/hornblende spots. Commonly mined in Longido, Tanzania.
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