opposite of mafic; "rich in silica"; a term applied to magmas or igneous rocks that are silica-rich such as rhyolites or granites.

Said of a silica-rich igneous rock or magma. Usually at least 65% or 2/3rds of the rock is composed of silica.

Rich in silica with relatively little iron and magnesium.

Pertaining to, derived from, or resembling, silica; specifically, designating compounds of silicon; as, silicic acid.