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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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for tridymite
  • Only six forms appear on this diagram, and there is considerable question whether tridymite is truly stable.
  • Cristobalite and tridymite are two other forms of crystalline silica.
  • Other types of silica include cristobalite and tridymite.

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