Obsidian lan Gritstone Definition
definisi
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
gritstone utawa grit punika hard, coarse-grained, siliceous sandstone
asal
Ethiopia
pennines, england
Etimologi
saka obsidianus latin, misprint saka obsianus (lapis) (watu) saka obsius
saka grit + watu
kelas
batuan beku
rocks sedimentary
sub-kelas
awet rock, medium atose rock
awet rock, hard rock
group
vulkanik
ora ditrapake
kategori liyane
rock opaque
rock grained coarse, rock opaque