Poppiite from the Yamato Mine, Kagoshima prefecture, Japan

Abstract

Poppiite, the V end-member of the pumpellyite group mineral is found at manganese ore deposit from the Yamato Mine, Kagoshima Prefecture. The mineral occurs as thin veinlets cutting Kutnohorite - Pyroxmangite manganese ore. Poppiite is the first occurrence in Japan. The empirical formula is (Ca_1.60Mn_0.28Na_0.11)_Σ1.99(V_0.72Fe_0.14Mg_0.11)_Σ0.97(V_1.99Al_0.01)_Σ2.00
(Si_3.02Ti_0.01)_Σ3.03O_10.64(OH)_3.36. XRD data are : a = 19.274(7), b = 6.052(2), c = 8.883(2) Å, β= 97.34(3)°, V = 1027.7(7) ų, seven strongest XRD lines [d in Å (I)] are : 3.820(75), 2.935(100), 2.752(60), 2.658(65), 2.556(60), 2.205(45), 1.617(60).