metamorphic
Ruby Zoisite
Anyolite (Ca2Al3(SiO4)3(OH) + Al2O3:Cr)
Hardness: 6-7 (Zoisite) and 9 (Ruby). Color: Mottled green with red or magenta spots and black streaks. Luster: Vitreous to pearly. Crystal Structure: Orthorhombic and Hexagonal. Cleavage: Perfect in zoisite, none in ruby.
- Hardness
- 6-7 (Zoisite) and 9 (Ruby)
- Color
- Mottled green with red or magenta spots and black streaks
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-7 (Zoisite) and 9 (Ruby). Color: Mottled green with red or magenta spots and black streaks. Luster: Vitreous to pearly. Crystal Structure: Orthorhombic and Hexagonal. Cleavage: Perfect in zoisite, none in ruby.
Formation & geological history
Formed through regional metamorphism of igneous and sedimentary rocks. Most occurrences date back to the Neoproterozoic era (540 million to 1 billion years ago) within the Mozambique Belt.
Uses & applications
Primarily used for lapidary work, including ornamental carvings, beads, cabochons, and decorative items. It is highly valued as a gemstone for collectors and metaphysical practitioners.
Geological facts
Also known as Anyolite, which comes from the Maasai word 'anyoli' meaning green. The black streaks found in the stone are actually inclusions of Black Hornblende.
Field identification & locations
Identify by its unique green, red, and black color combination. It is almost exclusively found in Tanzania. Collectors look for a high contrast between the green zoisite and the red ruby inclusions.
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