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
trondhjemite punika leucocratic (cahya colored) intrusive igneous rock. iku macem-macem tonalite kang plagioclase iku biasane ing wangun oligoclase. trondhjemites sing sok-sok ditepungi minangka plagiogranites.
1.3 Sajarah
1.3.1 asal
1.4.1 panemu
1.5 Etimologi
saka obsidianus latin, misprint saka obsianus (lapis) (watu) saka obsius
ora Sumadhiya
1.6 kelas
1.6.3 sub-kelas
awet rock, medium atose rock
awet rock, hard rock
1.7 kulawarga
1.7.2 group
1.8 kategori liyane
rock opaque
rock grained coarse, rock grained nggoleki, medium rock grained, rock opaque