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kategori liyane
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
saka obsidianus latin, misprint saka obsianus (lapis) (watu) saka obsius
awet rock, medium atose rock
rhyodacite iku sawijining rock vulkanik extrusive penengah ing komposisi antarane dacite lan rhyolite
rhyo lite + dacite: a rock antarané rhyolite lan dacite sing extrusive padha karo granodiorite
awet rock, medium atose rock
rock grained nggoleki, rock opaque