oligoclase

1. Any of a series of triclinic feldspars that form rocks (synset 114889467)
   hypernym: feldspar, felspar - any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium
   hyponym:

   • albite, white feldspar - a widely distributed feldspar that forms rocks
   • anorthite - rare plagioclastic feldspar occurring in many igneous rocks
   substance meronym:

   • dacite - a grey volcanic rock containing plagioclase and quartz and other crystalline minerals
   • basalt - the commonest type of solidified lava; a dense dark grey fine-grained igneous rock that is composed chiefly of plagioclase feldspar and pyroxene
   synonym: plagioclase

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