チタン石せきチタンせきMeanings1nountitanite; spheneA calcium titanium nesosilicate mineral; used as a minor ore of titanium and as a gemstone.チタン石せきはチタンの鉱こう石せき鉱こう物ぶつの一ひとつです。Titanite is one of the ore minerals of titanium.
