metamorphic
Ruby in Zoisite
Anyolite (combination of Ca2Al3(SiO4)3(OH) and Al2O3:Cr)
Hardness: 6.5-9 (Zoisite is 6.5, Ruby is 9); Color: Green with magenta-red inclusions and occasional black speckles; Luster: Vitreous to pearly; Crystal structure: Orthorhombic (Zoisite) and Trigonal (Ruby).
- Hardness
- 6
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6.5-9 (Zoisite is 6.5, Ruby is 9); Color: Green with magenta-red inclusions and occasional black speckles; Luster: Vitreous to pearly; Crystal structure: Orthorhombic (Zoisite) and Trigonal (Ruby).
Formation & geological history
Formed during regional metamorphism of magnesium-rich and aluminum-rich rocks. Most occurrences date to the Proterozoic or Paleozoic eras. It is specifically created through the interaction of ruby-bearing pegmatites with local country rocks.
Uses & applications
Primarily used as an ornamental stone for carvings, figurines, cabochons for jewelry, and as a popular specimen for mineral collectors.
Geological facts
The name 'Anyolite' is derived from the Maasai word 'anyoli', meaning green. It was first discovered in Tanzania in 1954 and remains the most significant source of this unique combination.
Field identification & locations
Identify in the field by the distinct contrast between the vibrant green zoisite matrix and the opaque, purplish-red corundum (ruby) crystals. It is almost exclusively found in Tanzania (Mundarara mine). Collectors should look for balanced color distribution.
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