different between igneous vs anorthosite

English

From Latin igneus (“fiery”).

igneous (not comparable)

Pertaining to or having the nature of fire; containing fire; resembling fire.
(geology) Resulting from, or produced by, great heat. With rocks, it could also mean formed from lava or magma.

anorthosite (countable and uncountable, plural anorthosites)

(petrology) A phaneritic, intrusive igneous rock characterized by a predominance of plagioclase feldspar.
- 1863, T. Sterry Hunt, "On the Chemical and Mineralogical Relations of Metamorphic Rocks", The American Journal of Science and Arts, Volume XXXVI, November, 1863, page 224:
  The second, or Labrador series is characterized, as already remarked, by the predominance of great beds of anorthosite, composed chiefly of triclinic feldspars […]

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