| Zaratite | |
|---|---|
 Zaratite from Tasmania | |
| General | |
| Category | Carbonates |
| Formula (repeating unit) | Ni3CO3(OH)4·4H2O |
| IMA symbol | Zar[1] |
| Strunz classification | 5.DA.70 |
| Crystal system | Isometric (in part amorphous) |
| Unit cell | a = 6.16 Å; Z = 1 |
| Identification | |
| References | [2][3][4] |
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 Manolita mine, Teixedelo, Cedeira, La Coruña province, Galicia, Spain[5] in 1851, and named after Spanish diplomat and dramatist Antonio Gil y Zárate (1793–1861).[2][4]
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ a b Mineral Data Publishing, PDF
- ^ Webmineral data
- ^ a b Mindat with location data
- ^ Martínez Alcíbar, Agustín. "Sobre el mineral de nickel de Galicia, con algunas consideraciones sobre el polimorfismo del sulfato de nickel y otras substancias". Revista Minera. 2: 175–184.