Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. inorganic material
7. rock (inorganic material)
8. igneous rock
9. [igneous rock by composition]
10. [igneous rock by composition: chemical]
11. acid igneous rock

Additional parents:

1. top of the aat hierarchies
2. Materials Facet
3. Materials
4. materials
5. materials by composition
6. inorganic material
7. rock
8. igneous rock
9. igneous rock by origin
10. extrusive rock

Narrower term/s

• quartz porphyry[+]
  • elvan

Anotations

Scope note:

Any of a number of extrusive acid igneous rocks, usually porphyritic and exhibiting flow lines, with phenocrysts of quartz and alkali feldspar in a glassy to cryptocrystalline groundmass; the extrusive equivalent of granite.