1) Monoclinic mineral 2) Nickel mineral
Found on
https://www.crosswordclues.com/clue/hellyerite
Hellyerite, NiCO3·6(H2O), is an hydrated nickel carbonate mineral. It is light blue to bright green in colour, has a hardness of 2.5, a vitreous luster, a white streak and crystallises in the monoclinic system. The crystal habit is as platy and mammillary encrustations on its matrix. ==Occurrence== The environment of formation, associated only wi...
Found on
http://en.wikipedia.org/wiki/Hellyerite
No exact match found.
