Plagioclase, Quartz, or Feldspathoid. Trachyte (/ˈTreɪˌkaɪt, ˈTrækˌaɪt/) Is an Extrusive Igneous Rock Composed Mostly of Alkali Feldspar. It Is Usually Light-Colored and Aphanitic (Fine-Grained), with Minor Amounts of Mafic Minerals, and Is Formed by the Rapid Cooling of Lava Enriched with Silica and Alkali Metals.
What Is Quartz Trachyte?
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Plagioclase, Quartz, or Feldspathoid. Trachyte (/ˈTreɪˌkaɪt, ˈTrækˌaɪt/) Is an Extrusive Igneous Rock Composed Mostly of Alkali Feldspar. It Is Usually Light-Colored and Aphanitic (Fine-Grained), with Minor Amounts of Mafic Minerals, and Is Formed by the Rapid Cooling of Lava Enriched with Silica and Alkali Metals.
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