monchiquite


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monchiquite

(mɒnˈʃiːkaɪt)
n
(Geological Science) a type of rock made up of large crystals of, among other constituents, olivine and amphibole and which is found in an analcite groundmass
References in periodicals archive ?
Analcime is a common constituent of all of the Oligocene rocks of the district, including phonolite, plagioclase phonolite, phonotephrite, tephriphonolite, vogesite, and monchiquite It occurs as drusy crystals in cavities, as irregular masses, as phenocrysts, and surrounding nepheline crystals (Lindgren and Ransome, 1906; Loughlin and Koschmann, 1935; Birmingham, 1987).
It also has been described as an accessory mineral in monchiquite and gray plagioclase phonolite (Birmingham, 1987).
Hauyne is common in small quantities as phenocrysts in phonolite and monchiquite (Loughlin and Koschmann, 1935; Birmingham, 1987).
Birmingham (1987) reported the occurrence of magnesiochromite as dark brown inclusions in olivine in monchiquite, phonotephrite and tephriphonolite.