syenite

  1. Home
  2. top of the aat hierarchies
  3. Materials Facet
  4. Materials (hierarchy name)
  5. materials (substances)
  6. [materials by composition]
  7. inorganic material
  8. rock (inorganic material)
  9. igneous rock
  10. [igneous rock by composition]
  11. [igneous rock by composition: chemical]
  12. intermediate igneous rock
  13. syenite
Scope note
A phanoerocrystalline intrusive igneous rock composed mostly of alkaline feldspar with or without a smaller amount of plagioclase and without notable quartz or nepheline content. The term can also refer to a granite varietal, quarried in antiquity at Syrene in Upper Egypt, in which biotite is substituted for or accompanied by hornblende.
syenite
Accepted term: 29-Apr-2024