(via The Canadian Gemmologist, Vol.III, No.3, Spring, 1982) I am a calcium aluminum silicate, crystallizing in the tetragonal system, and occurring in various colors. I am most often seen in a massive form, sometimes masquerading as a much more expensive green gemstone. They give me quite a variety of names, and one of them sounds like a famous volcano. What am I?
Answer: Vesuvianite (Idocrase)
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