TRIDYMITE
\tɹˈa͡ɪdɪmˌa͡ɪt], \tɹˈaɪdɪmˌaɪt], \t_ɹ_ˈaɪ_d_ɪ_m_ˌaɪ_t]\
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Pure silica, like quartz, but crystallizing in hexagonal tables. It is found in trachyte and similar rocks.
By Oddity Software
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Pure silica, like quartz, but crystallizing in hexagonal tables. It is found in trachyte and similar rocks.
By Noah Webster.