tachylite punika wangun vitreous saka kaca vulkanik basaltic. kaca iki alami dening cooling kanthi cepet saka basalt molten 0
saka tachylite german, saka tachy- + lutos greek telat, leleh 0
awet rock, medium atose rock 0
rock grained coarse, rock grained nggoleki, medium rock grained, rock opaque 0