馬ば蹄てい石せきばていせきじ字FuriganaMeanings1nounobsidianmineralogy›A mineralogical term for obsidian, a dark volcanic glass. The kanji literally mean 'horseshoe stone', possibly from its appearance or historical use.馬ば蹄てい石せきは火か山ざんガラスの一いっ種しゅで、黒
