trachyte

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  10. [igneous rock by composition]
  11. [igneous rock by composition: chemical]
  12. acid igneous rock
  13. felsite
  14. trachyte
Scope note
A class of volcanic rocks, light in color and density, chiefly composed of alkali feldspar in which a small amount of quartz or oligoclase may also be present.
trachyte
Accepted term: 29-Apr-2024