TY - JOUR T1 - On Two New Vanadium Minerals JF - Proceedings of the Royal Society of London (1854-1905) VL - 25 SP - 109 EP - 112 PY - 1876/01/01/ UR - http://dx.doi.org/10.1098/rspl.1876.0023 M3 - doi:10.1098/rspl.1876.0023 AU - Roscoe, H. ER -