monchiquite
noun1
Chemistry, Geography, Geology, Mineralogy, Natural sciences, Physical sciences A black, basaltic igneous rock consisting of a ground mass of automorphic augite and magnetite with many embedded phenocrysts, usually of olivine.
- It resembles the analcite basalts of the Highwood Mountains, in Montana, and the monchiquites of Brazil.1917, Geological Survey (U.S.), Professional Paper (issue 93, page 84)
- Seven samples from monchiquite dykes analysed chemically by Upton et al. (1992), including trace elements and, for three rocks, Sr and Nd isotope data, were classified on chemical grounds as olivine melanephelinite […]2019, A. R. Woolley, Alkaline Rocks and Carbonatites of the World (part 4, page 450)
- Derived terms
- monchiquitic