troctolite

troctolite

▪ rock
      coarse-grained, intrusive igneous rock that is composed almost entirely of olivine (often iron-rich) and plagioclase feldspar (labradorite or bytownite). The olivine may be wholly altered to serpentine, which gives the rock a stippled appearance of red, green, brown, yellow, and black spots on a pale background, reminiscent of the skin of a trout (in German, troctolite is Forellenstein, “trout rock”). Occurrences of this olivine-bearing gabbro include Wolimierz, Pol.; Oslo, Nor.; and Cornwall, Eng.

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  • Troctolite — is a rare ultramafic intrusive rock type. It consists essentially of variable amounts of olivine and calcic plagioclase along with variable minor pyroxene. It thus is midway between peridotite and anorthosite.Troctolite is found in some… …   Wikipedia

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