PLAGIOCLASE a fine grained volcanic rock of intermediate composition consisting largely of plagioclase and one or more mafic minerals
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plagioclasesPLAGIOCLASE, a fine-grained volcanic rock of intermediate composition, consisting largely of plagioclase and one or more mafic minerals
plagioclasea fine-grained volcanic rock of intermediate composition, consisting largely of plagioclase and one or more mafic minerals
trachytefine-grained volcanic rock consisting essentially of alkali feldspar and one or more subordinate minerals, as hornblende or mica: the extrusive equivalent of syenite
andesiticdark-colored volcanic rock composed essentially of plagioclase feldspar and one or more mafic minerals, as hornblende or biotite
andesitesdark-colored volcanic rock composed essentially of plagioclase feldspar and one or more mafic minerals, as hornblende or biotite
andesitedark-colored volcanic rock composed essentially of plagioclase feldspar and one or more mafic minerals, as hornblende or biotite