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nounany of a series of triclinic feldspars that form rocks
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Definition that contains plagioclase
- basalt the commonest type of solidified lava; a dense dark grey fine-grained igneous rock that is composed chiefly of plagioclase feldspar and pyroxene
- moonstone a transparent or translucent gemstone with a pearly luster; some specimens are orthoclase feldspar and others are plagioclase feldspar
- plagioclastic of or relating to plagioclase
- amphibolite a metamorphic rock composed chiefly of amphibole and plagioclase
- dacite a grey volcanic rock containing plagioclase and quartz and other crystalline minerals