Aurichalcite
(Zn,Cu)5(CO3)2(OH)6IMA symbol: Achgrandfathered
Aurichalcite is a carbonate or nitrate mineral with the formula (Zn,Cu)5(CO3)2(OH)6, crystallizing in the monoclinic system. It has a Mohs hardness of 2, typically blue or green in color, with a pearly luster, a specific gravity of 3.54-3.64. Its streak is green.
Photos
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 1 21/m 1 |
| Cell (Å, °) | a = 13.82, b = 6.419, c = 5.29; α = 90, β = 101.04, γ = 90 |
| Cell volume | 461 ų, Z = 2 |
| Axial ratios | 2.1530:1:0.8241calculated from COD 2101233 |
| Source structure | COD 2101233 (Acta Crystallographica Section B, 1994) — 1 of 3 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 6.782 | 3.696 | 2.626 | 3.262 | 2.901 | 2.73 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 52.2 | 45.4 | 27.2 | 25.7 | 23 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 2101233; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.849 g/cm³calculated from COD 2101233 |
|---|---|
| Hardness (Mohs) | 2single sourceWikidata (CC0) 2single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 3.54-3.64 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | blue, greensingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | light bluesingle sourceWikidata (CC0) greensingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | pearlysingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Classification
| Nickel-Strunz (10th) | 5.BA.15Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 5.BA.15Wikidata (CC0) |
| Dana (8th) | 16a.4.2.1Wikidata (CC0) |