jinis
basalt alkalin, boninite, basalt alumina dhuwur, agêng segara Pegunungan basalt (morb), basalt tholeiitic, basaltic trachyandesite, mugearite lan shoshonite
Phyllite, Schist, lan Slate
fitur
tahan struktural dhuwur marang erosi lan iklim, rock grained banget nggoleki
gampang pecah dadi lancip piring, lumahan asring mengilap, rock grained banget nggoleki