metamorphic

Anyolite (Ruby in Zoisite)

Metamorphic rock composed primarily of green Zoisite (Ca2Al3(Si2O7)(SiO4)O(OH)), red Ruby (Al2O3:Cr), and black Tschermakite

AI-generated identification · may be incorrect

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.

Identified August 5, 2026More metamorphic →

Explore Anyolite (Ruby in Zoisite) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

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.