Blue verditer

Basic copper carbonate

Names
IUPAC name Dicopper carbonate dihydroxide
Other names copper carbonate hydroxide, cupric carbonate, copper carbonate
Identifiers
CAS Number	12069-69-1
3D model (JSmol)	Interactive image
ChemSpider	23796
ECHA InfoCard	100.031.909
PubChem CID	25503
InChI InChI=1S/CH2O3.2Cu.2H2O/c2-1(3)4;;;;/h(H2,2,3,4);;;2*1H2/q;2*+2;;/p-4 Key: ZMMDPCMYTCRWFF-UHFFFAOYSA-J InChI=1/CH2O3.2Cu.2H2O/c2-1(3)4;;;;/h(H2,2,3,4);;;2*1H2/q;2*+2;;/p-4 Key: ZMMDPCMYTCRWFF-XBHQNQODAP
SMILES C(=O)([O-])[O-].[OH-].[OH-].[Cu+2].[Cu+2]
Properties
Chemical formula	Cu2(OH)2CO3
Molar mass	221.114 g/mol
Appearance	green powder
Density	4 g/cm3
Melting point	200 °C (392 °F; 473 K)
Boiling point	290 °C (554 °F; 563 K) decomposes
Solubility in water	insoluble
Solubility product (Ksp)	7.08·10−9
Thermochemistry
Std molar entropy (So298)	88 J/mol·K
Std enthalpy of formation (ΔfHo298)	−595 kJ/mol
Hazards
Safety data sheet	Oxford MSDS
GHS pictograms
GHS signal word	Warning
GHS hazard statements	H302, H315, H319, H335
GHS precautionary statements	P261, P305+351+338
Lethal dose or concentration (LD, LC):
LD50 (median dose)	159 mg/kg (rat, oral)
US health exposure limits (NIOSH):
PEL (Permissible)	TWA 1 mg/m3 (as Cu)
REL (Recommended)	TWA 1 mg/m3 (as Cu)
IDLH (Immediate danger)	TWA 100 mg/m3 (as Cu)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Basic copper carbonate is a chemical compound, more properly called copper(II) carbonate hydroxide. It is an ionic compound (a salt) consisting of the ions copper(II) Cu²⁺
, carbonate CO²⁻
₃, and hydroxide HO⁻
.

The name most commonly refers to the compound with formula Cu
₂CO
₃(OH)₂. It is a green crystalline solid that occurs in nature as the mineral malachite. It has been used since antiquity as a pigment, and it is still used as such in artist paints, sometimes called verditer, green bice, or mountain green.

Sometimes the name is used for Cu
₃(CO
₃)₂(OH)₂, a blue crystalline solid also known as the mineral azurite. It too has been used as pigment, sometimes under the name mountain blue or blue verditer.