lamprophyre A dark-coloured, strongly porphyritic, intrusive igneous rock, containing abundant euhedral phenocrysts of biotite and/or amphibole which can be accompanied by phenocrysts of olivine, diopside, apatite, or opaque oxides, set in a mafic, felsic, or glassy groundmass. There are no felsic phenocrysts present in this rock type. The lamprophyres are subdivided into a number of types on the basis of their most abundant mafic component and the presence and type of feldspar in the groundmass. Lamprophyre types include minette, kerstantite, alnöite, vogesite, camptonite, and monchiquite, and are found intruded as dykes and sills.
More From encyclopedia.com
Monotype , Monotype •gripe, hype, mistype, pipe, ripe, sipe, slype, snipe, stripe, swipe, tripe, type, wipe •guttersnipe • bagpipe • standpipe •tailpipe • drain… mating type , mating type The equivalent in lower organisms (especially micro-organisms) of sexes in higher organisms. Microorganisms may be subdivided into mating… Type Specimen , Skip to main content type specimen Gilbert-type Delta , Skip to main content Gilbert-type delta Type , type / tīp/ • n. 1. a category of people or things having common characteristics: this type of heather grows better in a drier habitat blood types. ∎… subtype , subtype A relationship between data types. Type T1 is a subtype of type T2 if the set of all possible values of T1 is a subset of the set of all poss…
About this article
Updated About encyclopedia.com content Print Article
You Might Also Like