1 Definition
1.1 definisi
pumice punika rock vulkanik sing kasusun saka Highly vesicular atos kaca vulkanik tekstur, kang bisa utawa ora bisa ngemot kristal
lignite punika coal brownish alus kang nuduhake ngambah tetanduran lan ing antarané coal bituminous lan peat
1.2 Sajarah
1.2.1 asal
1.2.2 panemu
1.3 Etimologi
saka pomis french lawas, saka varian dialect latin saka pumex
saka french, kayu lignum latin + -ite1
1.4 kelas
batuan beku
rocks sedimentary
1.4.1 sub-kelas
awet rock, medium atose rock
awet rock, rock alus
1.5 kulawarga
1.5.1 group
1.6 kategori liyane
rock grained nggoleki, rock opaque
rock grained coarse, rock grained nggoleki, medium rock grained, rock opaque