Arkose lan Obsidian Definition
definisi
arkose punika rock sedimentary, khusus jinis sandstone ngemot paling sethithik 25% Feldspar
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
panemu
Alexandre brongniart
obsius
Etimologi
saka wilayah Auvergne saka prancis digunakake dening geologist Alexandre brongniart french 1826 sing Applied istilah iki kanggo sawetara sandstones feldspathic
saka obsidianus latin, misprint saka obsianus (lapis) (watu) saka obsius
kelas
rocks sedimentary
batuan beku
sub-kelas
awet rock, hard rock
awet rock, medium atose rock
group
ora ditrapake
vulkanik
kategori liyane
rock grained coarse, rock opaque
rock opaque