Tungsten minerals in association with scheelite in quartz veins from the Ishidera area, Wazuka, Kyoto Prefecture, have been examined using XRD, SEM-EDS, WDS, and XRF. The X-ray powder and chemical studies demonstrated the presence of anthoinite and mpororoite, forming a powdery mixture pseudomorphing scheelite. This is the first occurrence of these two mineral species in Japan. Another tungsten mineral was also found in association with them. It occurs as regular octahedral crystals up to 50 μm. The XRD data are in good agreement with pyrochlore supergroup minerals. Since chemical analysis shows WO3, Al2O3 and H2O to be the essential constituents, this mineral should be alumotungstite, which was is the first occurrence in Japan. However, the mineral species of alumotungstite was discredited by the CNMNC-IMA and was assimilated into the "hydrokenoelsmoreite" together with ferritungstite which is commonly found in Japan.
