Pb-containing apatite supergroup minerals from Numata City, Gunma Prefecture, Japan –pyromorphite, phosphohedyphane, mimetite, vanadinite–

Abstract

Pyromorphite, phosphohedyphane, mimetite and vanadinite which belong to apatite supergroup, are found in a quarry at Numata City, Gunma prefecture Japan. They are associated with descloizite, mottramite, beudantite and others. They occur as hexagonal euhedral crystals up to 1mm length or crusts in fissures of host rocks in alteration zone of gabbro. Sulfide minerals such as galena, sphalerite, arsenopyrite are rarely seen in this quarry. We describe here on the chemical analyses of their minerals, especially on phosphohedyphane, and mode of occurrence in this quarry.