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tridymite

[trid-uh-mahyt] /ˈtrɪd əˌmaɪt/
noun, Mineralogy.
1.
a polymorph of quartz occurring in the form of small crystals, commonly twinned, in siliceous volcanic rocks.
Origin of tridymite
1865-1870
1865-70; < German Tridymit, equivalent to tridym- (Greek trídym(os) triple, equivalent to tri- tri- + ()dymos didymous) + -it -ite1
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Based on the Random House Dictionary, © Random House, Inc. 2016.
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