Cobalt carbonate
Cobalt carbonate is the inorganic compound
Inorganic compound
Inorganic compounds have traditionally been considered to be of inanimate, non-biological origin. In contrast, organic compounds have an explicit biological origin. However, over the past century, the classification of inorganic vs organic compounds has become less important to scientists,...

 with the formula CoCO3. This reddish paramagnetic solid is an intermediate in the hydrometallurgical purification
Hydrometallurgy is part of the field of extractive metallurgy involving the use of aqueous chemistry for the recovery of metals from ores, concentrates, and recycled or residual materials...

 of cobalt from its ores, as an inorganic pigment, and as a precursor to catalysts. Commercially available pale violet basic cobalt carbonate, of formula with the formulaCoCO3(Co(OH)x(H2O)y (CAS 12069-68-0). Cobalt(II) carbonate occurs as the mineral spherocobaltite
Spherocobaltite is a mineral with chemical formula CoCO3. It is the carbonate salt of cobalt. It forms red trigonal crystals....

, which occurs as pink/red trigonal crystals with a specific gravity
Specific gravity
Specific gravity is the ratio of the density of a substance to the density of a reference substance. Apparent specific gravity is the ratio of the weight of a volume of the substance to the weight of an equal volume of the reference substance. The reference substance is nearly always water for...

 of 4.13g/cm3


Heating the carbonate, i.e. calcining, proceeds in the usual way:
CoCO3 → CoO + CO2

The resulting CoO converts reversibly to Cobalt(II,III) oxide|Co3O4]] at high temperatures.. It is an precursor to blue pottery glazes, famously in the case of Delftware
Delftware, or Delft pottery, denotes blue and white pottery made in and around Delft in the Netherlands and the tin-glazed pottery made in the Netherlands from the 16th century....


Like most transition metal carbonates, cobalt carbonate is insoluble in water but is readily attacked by mineral acids:
CoCO3 + 2 HCl + 5 H2O → [Co(H2O)
6]Cl2 + CO2
The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.