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单词 ground-mass
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ground-mass
ground-mass n. the compact basal part of an igneous rock, in which the distinctive crystals are imbedded.
ΘΚΠ
the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > part of
ground-mass1879
1879 F. Rutley Study of Rocks x. 168 In many cases felsite, or the groundmass of porphyries, consists of a microscopically fine-grained aggregate.
extracted from groundn.
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