Melanterite
Fe(SO4)·7H2OIMA symbol: Mlngrandfathered
Melanterite is a sulfate mineral with the formula Fe(SO4)·7H2O, crystallizing in the monoclinic system. It has a Mohs hardness of 2, typically white, green or yellow in color, with a vitreous luster, a specific gravity of 1-2. Its streak is red.
Photos
Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 1 21/c 1 |
| Cell (Å, °) | a = 14.06, b = 6.505, c = 10.943; α = 90, β = 105.75, γ = 90 |
| Cell volume | 963.273 ų, Z = 2 |
| Axial ratios | 2.1614:1:1.6822calculated from COD 9004774 |
| Source structure | COD 9004774 (The Canadian Mineralogist, 2003) — 1 of 15 structures |
Physical properties
| Density (calculated) | 1.825 g/cm³calculated from COD 9004774 |
|---|---|
| Hardness (Mohs) | 2single sourceWikidata (CC0) 2single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 1-2 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | green, white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) redsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 278.01 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Fe 20.09%, S 11.53%, O 63.3%, H 5.08% |
Classification
| Nickel-Strunz (10th) | 7.CB.35Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 7.CB.35Wikidata (CC0) |