Anthracite lan Obsidian Definition
definisi
Anthracite jinis rock sedimentary kang hard lan macem-macem batu bara sing wis luster dhuwur
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
asal
pennsylvania, kita
Ethiopia
panemu
Ora dingerteni
obsius
Etimologi
saka anthrakites greek, saka anthrax, anthrak meaning coal
saka obsidianus latin, misprint saka obsianus (lapis) (watu) saka obsius
kelas
rocks metamorphic
batuan beku
sub-kelas
awet rock, rock alus
awet rock, medium atose rock
kategori liyane
rock grained coarse, rock grained nggoleki, medium rock grained, rock opaque
rock opaque