Mixite
Cu6Bi(AsO4)3(OH)6·3H2OIMA symbol: Mixgrandfathered
Mixite is a phosphate, arsenate, or vanadate mineral with the formula Cu6Bi(AsO4)3(OH)6·3H2O, crystallizing in the hexagonal system. It has a Mohs hardness of 3-4, typically green in color, a specific gravity of 3.79. Its streak is green.
Photos
Crystallography
| Crystal system | hexagonal crystal systemWikidata (CC0) |
|---|---|
| Space group | P 63/m |
| Cell (Å, °) | a = 13.633, b = 13.633, c = 5.913; α = 90, β = 90, γ = 120 |
| Cell volume | 951.747 ų, Z = 2 |
| Axial ratios | 1.0000:1:0.4337calculated from COD 9006444 |
| Source structure | COD 9006444 (Physics and Chemistry of Minerals, 1997) — 1 of 4 structures |
Physical properties
| Density (calculated) | 4.016 g/cm³calculated from COD 9006444 |
|---|---|
| Hardness (Mohs) | 3-4single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 3.79 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | greensingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | greenDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 1163.1 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Cu 32.78%, Bi 17.97%, As 19.32%, O 28.89%, H 1.04% |
Classification
| Nickel-Strunz (10th) | 8.DL.15Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.DL.15Wikidata (CC0) |