- tried and true,
Origin of tridymite
Examples from the Web for tridymite
The crystals, called cristobalite and tridymite, swim in clouds around stars just before they begin to form planets.Space Bling: From Diamond Planets to Crystal Oceans to Precious Moon Jewels|Alexa Valiente, Jaewon Kang|October 13, 2012|DAILY BEAST
Spherulites may be regarded as radiate aggregates of such microliths (mostly felspar mixed with quartz or tridymite).
When crystalline grains or blebs of quartz occur, we have a quartz-trachyte; when tridymite is abundant, as in the trachyte of Co.Volcanoes: Past and Present|Edward Hull