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high-potassium basalt

high-potassium basalt An igneous rock of basaltic composition characterized by the appearance of sanidine as well as labradorite in the groundmass, and by K2O/Na2O> 1. Such basalts are commonly found well inland on the continental side of a plate subduction zone. The K2O content of basalts in these above-subductionzone environments increases inland as the depth to the subducted oceanic slab increases.

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"high-potassium basalt." A Dictionary of Earth Sciences. . Encyclopedia.com. 14 Dec. 2017 <http://www.encyclopedia.com>.

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labradorite

labradorite (lăb´rədôrīt´, lăbrədôr´īt), a variety of plagioclase feldspar.

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labradorite

labradorite See PLAGIOCLASE FELDSPAR.

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"labradorite." A Dictionary of Earth Sciences. . Retrieved December 14, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/labradorite