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It occurs as crystals in limestone and is used a gemstone
Answer for the clue "It occurs as crystals in limestone and is used a gemstone ", 8 letters:
idocrase
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Wiktionary
Word definitions in Wiktionary
n. (context geology English) vesuvianite
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Vesuvianite \Ve*su"vi*an*ite\, n. (Min.) A mineral occurring in tetragonal crystals, and also massive, of a brown to green color, rarely sulphur yellow and blue. It is a silicate of alumina and lime with some iron magnesia, and is common at Vesuvius. Also ...
WordNet
Word definitions in WordNet
n. a green or yellow or brown mineral consisting of a hydrated silicate; it occurs as crystals in limestone and is used a gemstone [syn: vesuvianite , vesuvian ]