Bayldonite
Cu3PbO(AsO3OH)2(OH)2IMA symbol: Baygrandfathered
Bayldonite is a phosphate, arsenate, or vanadate mineral with the formula Cu3PbO(AsO3OH)2(OH)2, crystallizing in the monoclinic system. It has a Mohs hardness of 4-5, typically black or green in color, with a resinous luster, a specific gravity of 4.19. Its streak is green.
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | C 1 2/c 1 |
| Cell (Å, °) | a = 10.147, b = 5.892, c = 14.081; α = 90, β = 106.05, γ = 90 |
| Cell volume | 809.034 ų, Z = 4 |
| Axial ratios | 1.7222:1:2.3899calculated from COD 9007628 |
| Source structure | COD 9007628 (Acta Crystallographica, Section B, 1979) |
Powder X-ray diffraction (calculated)
| d (Å) | 3.146 | 3.229 | 2.932 | 4.519 | 2.541 | 2.659 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 53.8 | 44.3 | 40.6 | 38 | 35.5 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9007628; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 5.827 g/cm³calculated from COD 9007628 |
|---|---|
| Hardness (Mohs) | 4-5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 4.19 g/cm3single sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Color | black, greensingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | greensingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | resinoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 727.71 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Cu 26.2%, Pb 28.47%, O 24.18%, As 20.59%, H 0.55% |
Classification
| Nickel-Strunz (10th) | 8.BH.45Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.BH.45Wikidata (CC0) |