metamorphic
Ruby in Zoisite
Anyolite (composite of Corundum Al2O3 and Zoisite Ca2Al3(SiO4)(Si2O7)O(OH))
Hardness: 6-7 (zoisite) and 9 (ruby); Color: Green with magenta/red inclusions and black patches; Luster: Vitreous to pearly; Crystal structure: Orthorhombic (zoisite) / Hexagonal (ruby); Cleavage: Perfect on one plane (zoisite); Specific gravity: 3.35
- Hardness
- 6-7 (zoisite) and 9 (ruby)
- Color
- Green with magenta/red inclusions and black patches
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-7 (zoisite) and 9 (ruby); Color: Green with magenta/red inclusions and black patches; Luster: Vitreous to pearly; Crystal structure: Orthorhombic (zoisite) / Hexagonal (ruby); Cleavage: Perfect on one plane (zoisite); Specific gravity: 3.35
Formation & geological history
Formed through regional metamorphism of igneous or sedimentary rocks containing calcium and aluminum. Primarily found in Tanzania, specifically the Longido region, dated to the Neoproterozoic Era.
Uses & applications
Predominantly used for ornamental purposes, lapidary work, cabochons for jewelry, and metaphysical carvings or tower points.
Geological facts
Also known as Anyolite, which is derived from the Maasai word 'anyoli' meaning green. It is unique among gemstones for the striking contrast between ruby crystals and the zoisite matrix.
Field identification & locations
Identify by the distinctive green color groundmass with vivid pink/purple ruby spots and black tschermakite streaks. Found almost exclusively in Tanzania.
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