Clinoclase
Cu3(AsO4)(OH)3IMA symbol: Cnograndfathered
Clinoclase is a phosphate, arsenate, or vanadate mineral with the formula Cu3(AsO4)(OH)3, crystallizing in the monoclinic system. It has a Mohs hardness of 2.5-3, typically black, blue or green in color, with a pearly or resinous luster, a specific gravity of 4.19-4.36. Its streak is green.
Photos
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 1 21/c 1 |
| Cell (Å, °) | a = 7.257, b = 6.457, c = 12.378; α = 90, β = 99.51, γ = 90 |
| Cell volume | 572.043 ų, Z = 4 |
| Axial ratios | 1.1239:1:1.9170calculated from COD 9007852 |
| Source structure | COD 9007852 (Acta Crystallographica, Section C, 1990) — 1 of 3 structures |
Physical properties
| Density (calculated) | 4.384 g/cm³calculated from COD 9007852 |
|---|---|
| Hardness (Mohs) | 2.5-3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 4.19-4.36 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | black, blue, greensingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | greensingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | pearly, resinous, vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 380.58 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Cu 50.09%, As 19.69%, O 29.43%, H 0.79% |
Classification
| Nickel-Strunz (10th) | 8.BE.20Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.BE.20Wikidata (CC0) |
| Dana (8th) | 41.3.1.1Wikidata (CC0) |