. "Olivine-orthopyroxene-microgabbro"@en . . "Olivine-orthopyroxene-microgabbro"@en . . . . "stable"@en . . "MCOOPG"@en . "Olivine-orthopyroxene-microgabbro - A type of microgabbro. In the Rock Classification Scheme, it is the medium-grained equivalent of olivine-orthopyroxene-gabbro. British Geological Survey Research Report RR/99/06, section 5.1."@en .