单词 powellite 释义 powellite2 Min.|palat|[Named 1891, after Major J. W. Powell: see -ite1.]Molybdate and tungstate of calcium, of yellow colour and resinous lustre.1897Amer. Jrnl. Sc. Ser. iii. XLI. 138 Powellite—calcium molybdate; a new mineral specie...