Item talk:Q41460
From geokb
Mindat Description
Igneous rocks that mostly do not fit into the standard QAPF, TAS and ultramafic diagrams
Geoscience Ontology Description
Rock with 'exotic' mineralogical, textural or field setting characteristics; typically dark colored, with abundant phenocrysts. Criteria include: presence of greater than 10 percent melilite or leucite, or presence of kalsilite, or greater than 50 percent carbonate minerals. Includes Carbonatite, Melilitic rock, Kalsilitic rocks, Kimberlite, Lamproite, Leucitic rock and Lamprophyres.
