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tridymite

[ trid-uh-mahyt ]

noun

, Mineralogy.
  1. a polymorph of quartz occurring in the form of small crystals, commonly twinned, in siliceous volcanic rocks.


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Word History and Origins

Origin of tridymite1

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

The crystals, called cristobalite and tridymite, swim in clouds around stars just before they begin to form planets.

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

Spherulites may be regarded as radiate aggregates of such microliths (mostly felspar mixed with quartz or tridymite).

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