Apr 01, 2020 · Like its serpentine counterparts, talc has also a Ni analogue called willemseite [Ni 3 Si 4 O 10 (OH) 2] which forms with the Fe analogue [Fe 3 Si 4 O 10 (OH) 2] and comes into existence in a similar way as the great variety of Ni phyllosilies as a residual clay mineral in siliceous Ni laterites on ultrabasic parent rocks (Tröger ...