Formula: Ni3(CO3)(OH)4.4H2O
Hydrated carbonate containing hydroxyl, nickel-bearing mineral
Crystal System: Isometric
Specific gravity: 2.57 to 2.649 measured, 2.67 calculated
Hardness: 3½
Streak: Light green
Colour: Emerald-green, green in transmitted light
Solubility: Readily soluble in heated dilute hydrochloric acid with effervescence
Common impurities: Mg

Igneous environments
Metamorphic environments

Zaratite is an uncommon secondary mineral in basic igneous rocks and serpentinite formed by alteration of chromite, pentlandite, pyrrhotite and millerite. Associated minerals include antigorite, brucite, hydromagnesite, calcite, aragonite and dolomite, as well as chromite, pentlandite and pyrrhotite (HOM, Mindat, Dana).


At the Heazlewood district, Waratah-Wynyard municipality, Tasmania, Australia, zaratite occurs as an alteration product of heazlewoodite (Dana).

At Kraubath an der Mur, Leoben District, Styria, Austria, zaratite occurs with millerite and chromite (Dana).

At Rapice Hill, Nové Město pod Smrkem, Frýdlant, Liberec District, Liberec Region, Czech Republic, zaratite occurs as an alteration product of millerite in geodes and sideritic septaria (Dana).

At Lillaz, Cogne, Cogne Valley, Aosta Valley, Italy, zaratite occurs in serpentinite with aragonite and nesquehonite (Dana).

At the type locality, the Manolita mine, Teixidelo, Cedeira, A Coruña, Galicia, Spain, zaratite is associated with magnetite (Mindat).

At Swinna Ness, Unst, Shetland, Scotland, UK, zaratite occurs in serpentinite (Dana).

At Wood's Chrome Mine, Texas, Little Britain Township, State Line Chromite Mining District, Lancaster county, Pennsylvania, USA, zaratite occurs with chromite (Dana).


Zaratite is an alteration product of chromite, pentlandite, pyrrhotite, millerite and meteoritic iron (Dana, HOM).

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