1 Definition
1.1 definisi
gritstone utawa grit punika hard, coarse-grained, siliceous sandstone
obsidian punika kaca vulkanik alami kawangun minangka rock igneous extrusive. diprodhuksi nalika lahar felsic extruded saka gunung mbledhos ndingin kanthi cepet karo wutah kristal minimal
1.2 Sajarah
1.2.1 asal
pennines, england
Ethiopia
1.2.2 panemu
1.3 Etimologi
saka grit + watu
saka obsidianus latin, misprint saka obsianus (lapis) (watu) saka obsius
1.4 kelas
rocks sedimentary
batuan beku
1.4.1 sub-kelas
awet rock, hard rock
awet rock, medium atose rock
1.5 kulawarga
1.5.1 group
1.6 kategori liyane
rock grained coarse, rock opaque
rock opaque