| 单词 | tridymite |
| 例句 | That may tell something about the origin of the sediments, or it is possible that tridymite forms through a different process on Mars. Mars Rover Finds Changing Rocks, Surprising Scientists 2015-12-17T05:00:00Z 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 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. The Planetoid of Peril On Earth, tridymite generally forms at high temperatures in volcanic or metamorphic rocks, not a finely layered sedimentary rock like Buckskin. Mars Rover Finds Changing Rocks, Surprising Scientists 2015-12-17T05:00:00Z |
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