Item talk:Q43277
From geokb
Mindat Description
A coarse-grained crystalline rock with <90% mafics, 10-60% of felsics being foids and alkali feldspar < plagioclase; plagioclase is calcic
Geoscience Ontology Description
Phaneritic crystalline igneous rock in which M is less than 90, the plagioclase to total feldspar ratio is greater than 0.5, feldspathoids form 10-60 percent of the QAPF fraction, and plagioclase has anorthite content greater than 50 percent. These rocks typically contain large amounts of mafic minerals. Includes rocks defined modally in QAPF fields 13 and 14.
