Crossword clues for Obsidian, once 4 lettersAnswerClueLAVAWhence obsidianLAVAObsidian, onceLAVAIt forms obsidianLAVAObsidian sourceLAVAObsidian's sourceLAVAObsidian, originallyLAVARock akin to obsidian.LAVAObsidian.LAVAObsidian, e.g.LAVAObsidian, before coolingLAVAObsidian rock producerLAVAWhat obsidian forms fromLAVAIt may cool into obsidianLAVASource of obsidian or pumiceXXXXObsidian, onceLAVASource of obsidianOBSIDIANIgneous rockOBSIDIANArrowhead materialOBSIDIANGlassy volcanic rock.OBSIDIANVolcanic glass used in Stone Age arrowheadsOBSIDIANDark volcanic glassOBSIDIANVolcanic glassOBSIDIANRelative of perliteBLACKBLACKBLACKBLACKObsidianMAGMAObsidian, onceVOLCANICLike obsidian and pumiceLAVASSources of obsidianIGNEOUSLike basalt and obsidian