groundmass
groundmass in igneous and metamorphic rocks is comparable to the matrix in sedimentary rocks; fine-crystalline mass in which the coarser crystals "float"
en-GB/ɡɹaʊndmæs/
en-US/ˈɡɹaʊndˌmæs/
groundmass in igneous and metamorphic rocks is comparable to the matrix in sedimentary rocks; fine-crystalline mass in which the coarser crystals "float"