norite
A coarse-grained basic igneous rock composed
of essential calcic plagioclase and
orthopyroxene. Norites also can contain
up to 50% clinopyroxene and can be considered orthopyroxene dominated gabbro.
Minor components can include biotite and
hornblende. Norite is generally found
in layered igneous intrusions formed by progressive crystal fractionation.
The crystallisation of large amounts of orthopyroxene can occur by the reaction
of olivine with the magma.
Norite is sometimes associated with anorthosite
and troctolite. It is found extensively
in the highland regions of the Moon.
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