Secondary phosphates with montebrasite from Nagatare, Fukuoka Prefecture, Japan

Abstract

Alteration minerals such as crandallite-goyazite-waylandaite series, apatite, muscovite, lepidolite, cookeite and topaz were confirmed in montebrasite [LiAlPO₄(OH, F)] from Nagatare LCT pegmatite, Fukuoka Prefecture, Japan. In addition, the first occurrence of lacroixite [NaAl(PO₄)F], wardite [NaAl₃(PO₄)₂(OH)₄·2H₂O], viitaniemiite [Na(Ca, Mn)Al(PO₄)(F, OH)₃], morinite [NaCa₂Al₂(PO₄)₂(F, OH)₅·2H₂O], petitjeanite [Bi₃O(PO₄)₂(OH)] and smrkovecite [Bi₂O(PO₄)(OH)] in Japan was also detected. These features indicate that several stages of alterations occurred in the late stage of the pegmatite forming process in Nagatare LCT pegmatite.