gritstone utawa grit punika hard, coarse-grained, siliceous sandstone
boninite punika rock extrusive mafic kang dhuwur ing Magnesium silika isi, kawangun ing lingkungan ngarep-busar, biasane sak orane tumrap sekolah awal saka subduksi
rock grained coarse, rock opaque
rock grained nggoleki, rock opaque