Azurite

Cu₃(CO₃)₂(OH)₂IMA symbol: Azugrandfathered

Azurite is a carbonate or nitrate mineral with the formula Cu3(CO3)2(OH)2. It has a Mohs hardness of 3.5-4, typically blue in color, with an adamantine or vitreous luster, a specific gravity of 3.49. Its streak is blue.

Photos

Crystallography

Space group	P 1 21/c 1
Cell (Å, °)	a = 5.011, b = 5.85, c = 10.353; α = 90, β = 92.41, γ = 90
Cell volume	303.223 Å³, Z = 2
Axial ratios	0.8566:1:1.7697calculated from COD 9007013
Source structure	COD 9007013 (Physics and Chemistry of Minerals, 2001)

Powder X-ray diffraction (calculated)

d (Å)	3.534	5.172	3.675	2.515	2.228	2.289
I/I₀	100	60.2	54.6	38.6	34.2	31.8

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9007013; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)	3.775 g/cm³calculated from COD 9007013
Hardness (Mohs)	3.75single sourceWikidata (CC0) 3.5-4single sourceDana, System of Mineralogy, 6th ed. (1892)
Specific gravity	3.49 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892)
Color	bluesingle sourceDana, System of Mineralogy, 6th ed. (1892)
Streak	light bluesingle sourceWikidata (CC0) bluesingle sourceDana, System of Mineralogy, 6th ed. (1892)
Luster	adamantine, vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892)

Chemistry (calculated)

Molecular weight	344.67 g/molcalculated from the IMA formula
Composition (wt%)	Cu 55.31%, C 6.97%, O 37.14%, H 0.58%

Classification

Nickel-Strunz (10th)	5.BA.05Wikidata (CC0)
Nickel-Strunz (9th)	5.BA.05Wikidata (CC0)
Dana (8th)	16a.2.1.1Wikidata (CC0)