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tridymite

[ trid-uh-mahyt ]
/ ˈtrɪd əˌmaɪt /
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noun Mineralogy.
a polymorph of quartz occurring in the form of small crystals, commonly twinned, in siliceous volcanic rocks.
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Origin of tridymite

1865–70; <German Tridymit, equivalent to tridym- (Greek trídym(os) triple, equivalent to tri-tri- + ()dymosdidymous) + -it-ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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