Trachyte

Trachyte

Jesse Russell Ronald Cohn

     

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ISBN: 978-5-5118-7227-8

High Quality Content by WIKIPEDIA articles! Trachyte is an igneous volcanic rock with an aphanitic to porphyritic texture. The mineral assemblage consists of essential alkali feldspar; relatively minor plagioclase and quartz or a feldspathoid such as nepheline may also be present. (See the QAPF diagram). Biotite, clinopyroxene and olivine are common accessory minerals.

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