metamorphic
Ruby Zoisite
Anyolite (Zoisite with Ruby and Pargasite)
Hardness: 6-7 (Zoisite) to 9 (Ruby); Color: Bright green with purplish-red inclusions and black specks; Luster: Vitreous to dull; Crystal structure: Orthorhombic (Zoisite) and Trigonal (Ruby); Specific Gravity: 3.35
- Hardness
- 6-7 (Zoisite) to 9 (Ruby)
- Color
- Bright green with purplish-red inclusions and black specks
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 (Zoisite) to 9 (Ruby); Color: Bright green with purplish-red inclusions and black specks; Luster: Vitreous to dull; Crystal structure: Orthorhombic (Zoisite) and Trigonal (Ruby); Specific Gravity: 3.35
Formation & geological history
Formed through regional metamorphism of magnesium-rich rocks. It is primarily found in the Merelani Hills of Tanzania, originating from the Neoproterozoic era.
Uses & applications
Mostly used for ornamental carvings, cabochons for jewelry, and as a popular collector's specimen.
Geological facts
Known as 'Anyolite', derived from the Maasai word 'anyoli' meaning green. The black specks are typically the mineral Tschermakite (a type of pargasite/hornblende).
Field identification & locations
Identify by the high-contrast combination of pistachio-green zoisite and opaque red ruby crystals. Primarily found in Tanzania; look for the characteristic black amphibole spots which distinguish it from ruby in fuchsite.
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