granophyre

noun

1. a fine-grained or porphyritic granitic rock with a micrographic intergrowth of the minerals of the groundmass.

noun

1. a fine-grained granitic rock in which irregular crystals of intergrown quartz and feldspar are embedded in a groundmass of these minerals

1. A fine-grained igneous rock that has large intergrown crystals of quartz and feldspar in the matrix.