1 Definition
1.1 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
talc karbonat nanging urutan rock utawa komposisi mineral ditemokaké ing rocks ultramafic metamorphic.
1.2 Sajarah
1.2.1 asal
Ethiopia
china, usa, wétan tengah
1.2.2 panemu
1.3 Etimologi
saka obsidianus latin, misprint saka obsianus (lapis) (watu) saka obsius
saka abad tengah latin, talcum
1.4 kelas
batuan beku
rocks metamorphic
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 opaque
rock grained nggoleki, rock opaque