Conichalcite
CaCu(AsO4)(OH)IMA symbol: Congrandfathered
Conichalcite is a phosphate, arsenate, or vanadate mineral with the formula CaCu(AsO4)(OH), crystallizing in the orthorhombic system. It has a Mohs hardness of 3, typically green in color, a specific gravity of 4.19. Its streak is green.
Photos
-Conichalcite-160513.jpg){kind=link}
Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 21 21 21 |
| Cell (Å, °) | a = 7.3822, b = 5.8146, c = 9.2136; α = 90, β = 90, γ = 90 |
| Cell volume | 395.49 ų, Z = 4 |
| Axial ratios | 1.2696:1:1.5846calculated from COD 2219454 |
| Source structure | COD 2219454 (Acta Crystallographica Section E, 2008) — 1 of 4 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.836 | 3.116 | 2.596 | 1.602 | 2.549 | 4.092 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 88.5 | 79.8 | 49.8 | 48.9 | 38 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 2219454; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 4.359 g/cm³calculated from COD 2219454 |
|---|---|
| Hardness (Mohs) | 3single sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Specific gravity | 4.19 g/cm3corroboratedFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Color | greensingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Streak | greensingle sourceWikidata (CC0) |
Chemistry (calculated)
| Molecular weight | 259.55 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Ca 15.44%, Cu 24.48%, As 28.87%, O 30.82%, H 0.39% |
Classification
| Nickel-Strunz (10th) | 8.BH.35Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 8.BH.35Wikidata (CC0) |