1 Definition
1.1 definisi
essexite kang uga dikenal minangka nepheline monzogabbro, iku werna abu-abu utawa ireng holocrystalline plutonic rock iigneous peteng
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
1.2 Sajarah
1.2.1 asal
1.2.2 panemu
1.3 Etimologi
saka dhaerah ing Essex County, massachusetts, kita
saka obsidianus latin, misprint saka obsianus (lapis) (watu) saka obsius
1.4 kelas
1.4.1 sub-kelas
awet rock, hard rock
awet rock, medium atose rock
1.5 kulawarga
1.5.1 group
1.6 kategori liyane
rock grained nggoleki, rock opaque
rock opaque