Collin Knopp-Schwyn
2019 WikiJournal of Science  
Widgiemoolthalite is a rare hydrated nickel(II) carbonate mineral with the chemical formula (Ni,Mg)5(CO3)4(OH)2·5H2O. Usually bluish-green in color, it is a brittle mineral formed during the weathering of nickel sulfide. Present on gaspéite surfaces, widgiemoolthalite has a Mohs scale hardness of 3.5 and an unknown though likely disordered crystal structure.
doi:10.15347/wjs/2019.007 fatcat:l25qikydmzcwtiopfgqgkj4jem