The finer grained materials of igneous rocks in which larger crystals and xenoliths are enclosed.
The matrix of relatively fine-grained material between the phenocrysts in a porphyritic rock.
A term sometimes used for the matrix of a sedimentary rock.
the matrix of fine-grained crystalline material in which larger crystals are embedded
The fine-grained material that encloses larger grains in sedimentary or igneous rocks.
the crystalline, granular, or glassybase of a porphyry, in which the more prominent crystals are embedded. [AHDOS