metamorphic
Anyolite (Ruby in Zoisite)
Metamorphic rock composed primarily of green Zoisite (Ca2Al3(Si2O7)(SiO4)O(OH)), red Ruby (Al2O3:Cr), and black Tschermakite
Hardness varies due to components (Ruby is 9 on Mohs scale, Zoisite is 6.5). Displays a combination of striking apple green, deep red/pink, and black or dark green speckled inclusions. Vitreous to pearly luster. Crystal structure is orthorhombic (zoisite) and trigonal (ruby). Specific gravity is around 3.1 to 3.4.
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Physical properties
Hardness varies due to components (Ruby is 9 on Mohs scale, Zoisite is 6.5). Displays a combination of striking apple green, deep red/pink, and black or dark green speckled inclusions. Vitreous to pearly luster. Crystal structure is orthorhombic (zoisite) and trigonal (ruby). Specific gravity is around 3.1 to 3.4.
Formation & geological history
Formed through high-pressure metamorphic processes involving intense tectonic activity, typically in amphibolite facies environments where chromium-rich solutions interact with corundum and zoisite-bearing rocks.
Uses & applications
Widely used as a decorative ornamental stone, carved into figurines, polished into tumbled stones, and used in high-end jewelry settings.
Geological facts
First discovered in 1954 in the Longido mining district of northern Tanzania. The name 'Anyolite' is derived from the Maasai word 'anyanyette', meaning green.
Field identification & locations
Easily identifiable by the stark color contrast between the vibrant green zoisite matrix and the bright pink-to-red ruby crystals. Primarily sourced from Tanzania and parts of India.
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