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tridymite

American  
[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.

Etymology

Origin of tridymite

1865–70; < German Tridymit, equivalent to tridym- ( Greek trídym ( os ) triple, equivalent to tri- tri- + ( dí ) dymos didymous ) + -it -ite 1

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

When crystalline grains or blebs of quartz occur, we have a quartz-trachyte; when tridymite is abundant, as in the trachyte of Co.

From Volcanoes: Past and Present by Hull, Edward

It was of the texture and roughness of granite, but more heavily shot with quartz, or tridymite than any other granite he'd ever seen.

From The Planetoid of Peril by Ernst, Paul

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.