A Co-bearing nickel-rich iron monoarsenide corresponding in composition and structure: to a Ni-rich member of the orthorhombic FeAs-(Fe,Ni)As solid solution series of synthetic alloys occurs in chromite-niccolite ores from La Gallega, Spain. The name westerveldite is proposed for minerals in this solid solution series. The average composition of Co-bearing nickeloan westerveldite from La Gallega as determined by microprobe analyses is (Fe0.e35, Ni0.400, Co0.015)1.050 As1.000. The orthorhombic unit-cell has a = 3.46Å, b = 5.97Å, c = 5.33Å, all ± 0.01Å. The mineral shows strong reflection pleochroism in brownish and brownish grey colours, strong anisotropism between crossed nicols, a higher polishing hardness and apparently somewhat lower reflectance than maucherite. Westerveldite occurs in chromite-niccolite ores, where adjacent to later serpentine veinlets the niccolite is replaced by intergrowths of maucherite and westerveldite.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page of Westerveldite, (Fe,Ni,Co) as, a new mineral from la gallega, spain
You do not have access to this content, please speak to your institutional administrator if you feel you should have access.