Johannite
Cu(UO2)2(SO4)2(OH)2·8H2OIMA symbol: Jhgrandfathered
Johannite is a sulfate mineral with the formula Cu(UO2)2(SO4)2(OH)2·8H2O, crystallizing in the triclinic system. It has a Mohs hardness of 2-2.5, typically green in color, with a vitreous luster, a specific gravity of 3.19. Its streak is green.
Photos
Crystallography
| Crystal system | triclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P -1 |
| Cell (Å, °) | a = 8.903, b = 9.499, c = 6.812; α = 109.87, β = 112.01, γ = 100.4 |
| Cell volume | 469.944 ų, Z = 1 |
| Axial ratios | 0.9373:1:0.7171calculated from COD 9009607 |
| Source structure | COD 9009607 (Tschermaks Mineralogische und Petrographische Mitteilungen, 1982) |
Physical properties
| Density (calculated) | 3.377 g/cm³calculated from COD 9009607 |
|---|---|
| Hardness (Mohs) | 2single sourceWikidata (CC0) 2-2.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 3.19 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) |
| Luster | vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 973.86 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Cu 6.53%, U 48.88%, O 36.14%, S 6.59%, H 1.86% |
Classification
| Nickel-Strunz (10th) | 7.EB.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 7.EB.05Wikidata (CC0) |