NORITE

Norite

Norite is a mafic intrusive igneous rock composed largely of the calcium-rich plagioclase labradorite and hypersthene with olivine. Norite is essentially indistinguishable from gabbro without thin section study under the petrographic microscope. The principal difference between norite and gabbro, however, is the type of pyroxene of which it is composed; norite is predominately composed of orthopyroxenes, largely high magnesian enstatites, whereas the principal pyroxenes in gabbro are clinopyroxenes, generally medially iron-rich augites.

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norite

Noun

  1. A granular crystalline rock consisting essentially of a triclinic feldspar (such as labradorite) and hypersthene.


The above text is a snippet from Wiktionary: norite
and as such is available under the Creative Commons Attribution/Share-Alike License.

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