Jinshajiangite—a new Ba-Mn-Fe-Ti-bearing silicate mineral

Jinshajiangite, (Na, K)5(Ba, Ca)4(Fe2+, Mn)15(Ti, Fe3+, Nb)8(SiO4)15 (F, O, OH)10, is a new mineral which occurs as thin tabular crystals in an arfedsonite-rich albite dyke near the Jinshajiang River winding through Sichuan Province, China. Jinshajiangite is monoclinic. Possible space groupC2/m, Cm orC2. Unit cell:a=10.732,b=13.847,c=20.817 A,β=95°3′,z=2. The strongest lines in the X-ray diffraction pattern [d in (hkl)] are: 10.2 (7) (002), 3.44 (10) (\(\bar 311\), 310,\(\bar 205\), 006), 3.15 (8) (205), 2.630 (8) (136, 243), 2.570 (8) (\(\bar 430\)), 2.202 (4) (405), 1.755 (4) (\(\bar 536\)), and 1.715 (5b) (3. 1. 10). The new mineral is black red brownish red or golden red in color. Lustervitreous. Streak light yellow. Cleavges {010} and {100} perfect. H. (Vicker) 430 kg/mm2. Specific gravity 3.61 (meas.). Density 3.56 (cale.). It is optically biaxial positive, 2V=72,r