Norite, also known as
orthopyroxenegabbro, may be essentially indistinguishable from gabbro without
thin section study under the
petrographic microscope. The principal difference between norite and gabbro is the type of
pyroxene of which it is composed. Norite is predominantly composed of orthopyroxenes, largely high-magnesian
enstatite or an iron-bearing
hypersthene. The principal pyroxenes in gabbro are
clinopyroxenes, generally iron-rich
augites.[2][3]
^"Norite". alexstrekeisen.it. Retrieved March 1, 2018.
^Carmichael, Turner and Verhoogen, 1974, Igneous Petrology, McGraw-Hill, pp. 603–620
^Hyndman, Donald W., 1972, Igneous and Metamorphic Petrology, McGraw-Hill, pp. 122–139, esp. references.
^Petrus, Joseph A.; Ames, Doreen E.; Kamber, Balz S. (October 18, 2014), "On the track of the elusive sudbury impact: geochemical evidence for a chondrite or comet bolide (accepted for publication)", Terra Nova,
doi:10.1111/ter.12125