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Trachyte :: Trachyte (n.) An igneous rock, usually light gray in color and breaking with a rough surface. It consists chiefly of orthoclase feldspar with sometimes hornblende and mica..

Tridymite :: Tridymite (n.) Pure silica, like quartz, but crystallizing in hexagonal tables. It is found in trachyte and similar rocks..

Trachytoid :: Trachytoid (a.) Resembling trachyte; -- used to define the structure of certain rocks.

Sanidine :: Sanidine (n.) A variety of orthoclase feldspar common in certain eruptive rocks, as trachyte; -- called also glassy feldspar..

Domite :: Domite (n.) A grayish variety of trachyte; -- so called from the Puy-de-Dome in Auvergne, France, where it is found..

Liparite :: Liparite (n.) A quartzose trachyte; rhyolite.

Andesite :: Andesite (n.) An eruptive rock allied to trachyte, consisting essentially of a triclinic feldspar, with pyroxene, hornblende, or hypersthene..

Trachytic :: Trachytic (a.) Of, pertaining to, or resembling, trachyte..

Rhyolite :: Rhyolite (n.) A quartzose trachyte, an igneous rock often showing a fluidal structure..

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