High Quality Content by WIKIPEDIA articles! Zaratite is a bright emerald green nickel carbonate mineral with formula Ni3CO3(OH)4·4H2O. ZAratite crystallizes in the isometric crystal system as massive to mammillary encrustations and vein fillings. IT has a specific gravity of 2.6 and a Mohs hardness of 3 to 3.5. IT has no cleavage and is brittle to conchoidal fracture. THe luster is vitreous to greasy. IT is a rare secondary mineral formed by hydration or alteration of the primary nickel and iron bearing minerals, chromite, pentlandite, pyrrhotite, and millerite, during the serpentinization of ultramafic rocks. HEllyerite, NiCO3·6H2O, is a related mineral. IT was found originally in Galicia, Spain in 1851, and named after Spanish diplomat and dramatist Antonio Gil y Zarate (1793-1861).