jinis
rocks pumice, rocks obsidian, rocks perlite, rocks porphyritic.
schists mica, schists calc-silicate, schists grafit, blueschists, whiteschists, greenschists, hornblende Schist, talc Schist, chlorite Schist, garnet Schist, Schist glaucophane.
fitur
ngandhut asam ing alam, kasedhiya ing persil saka werna
gampang pecah dadi lancip piring, Gamelan kanggo tutul