In the picture you can see an Anyolite (also called Ruby Zoisite, Anyolite or Zoisite rock). This is a Metamorphite (metamorphic rock) – it forms with an increase in pressure or temperature in the depths of the Earth’s crust, causing metamorphosis (change), where new minerals form.
Anyolite comes from a metamorphosis of green Zoisite and the Ruby, often with black inclusions from the admixture pyroxene (or amphiboles). Pure Zoisite, on the other hand, is colorless. However, with admixtures it can also assume different colors, such as blue to blue-violet (Tanzanite) or red (Thulite).
Furthermore, metamorphosis in calcium-rich rocks such as amphibolite or pyroxene gneiss produce Zoisite. As a result Zoisite is rather rare, though the Metamorphite Anyolite is even more rare.
Anyolite was discovered in 1954 in Tanzania. The word means green in the language of the Maasai (Maa) – Anyole. In contrast to the pinkish gem above, Anyolites are predominantly green with very few pink spots.