抄録
Allanite is found in pegmatite or aplite dikes widely distributed in Angaku Mine field., Field ohservations indicate that the mineral is genetically related with granite gneiss which was intruded or caught up as xenolith by two-mica granite., The latter granite probably brought up allanites., The physical and chemical properties of allanite from Angaku were investigated., X-ray spectroanalysis was undertaken to determine the content of rare earth elements and it was shown that the content of each element was in following order, approximately agreeing with Harkins' Law : 58Ce, 57La, 60Nd, 59Pr, 62Sm, 64Gd, 63Eu., It is noticable that the water content in this allanite is notably small, so the allanite now in question can be called bucklandite., The chemical composition was determined from the analytical results and it was shown that the mineral belonged to the orthosilicate group.,
