Anyolite is a metamorphic rock consisting of a granular mass of bright green
chrome-zoisite with minor black
tschermakite (commonly both as grains a few mm diameter), containing conspicuous coarse porphyroblasts of
corundum (var.
ruby) which may be up to several centimetres across.
As a generic petrographic description of this rock would be a rather clumsy mouthful, (something like "corundum-tschermakite zoisiteite" ) it has been given a more euphonious name descriptive of its striking colour in the language of the people living in the area of its type locality in Tanzania.
