Example Sentences

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Rhyolites are closely connected with the quartz-trachytes, but present a marked fluidal, spherulitic, or perlitic structure.

From Volcanoes: Past and Present by Hull, Edward

Long-buried glassy lavas devitrify, or pass to a stony condition, under the unceasing action of underground waters; but their flow lines and perlitic and spherulitic structures remain to tell of their original state.

From The Elements of Geology by Norton, William Harmon