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
) 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 originally reported (in 1954) locality in Tanzania (http://www.mindat.org/loc-8256.html,
see also http://www.mindat.org/loc-211915.html
).Visit gemdat.org for gemological information about Anyolite.
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