Olivenite
Cu2(AsO4)(OH)IMA symbol: Oligrandfathered
Olivenite is a phosphate, arsenate, or vanadate mineral with the formula Cu2(AsO4)(OH), crystallizing in the orthorhombic system. It has a Mohs hardness of 3, typically white, black, brown or gray in color, with an adamantine or pearly luster, a specific gravity of 4.1-4.4. Its streak is brown or green.
Photos
Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 21/n 1 1 |
| Cell (Å, °) | a = 8.5844, b = 8.2084, c = 5.9258; α = 90.13, β = 90, γ = 90 |
| Cell volume | 417.556 ų, Z = 4 |
| Axial ratios | 1.0458:1:0.7219calculated from COD 9011399 |
| Source structure | COD 9011399 (Acta Crystallographica, Section E, 2008) — 1 of 7 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.966 | 4.877 | 5.933 | 2.458 | 2.652 | 3.804 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 62.8 | 56.5 | 38.5 | 31.8 | 31 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9011399; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 4.443 g/cm³calculated from COD 9011399 |
|---|---|
| Hardness (Mohs) | 3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 4.1-4.4 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | black, brown, gray, green, white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | brown, greensingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | adamantine, pearly, vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 283.02 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Cu 44.91%, As 26.47%, O 28.27%, H 0.36% |
Classification
| Nickel-Strunz (10th) | 8.BB.30Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.BB.30Wikidata (CC0) |
| Dana (8th) | 41.6.6.1Wikidata (CC0) |