Kieserite
Mg(SO4)·H2OIMA symbol: Ksrapproved
Kieserite is a sulfate mineral with the formula Mg(SO4)·H2O, crystallizing in the monoclinic system. It has a Mohs hardness of 3-3.5, typically white, gray or yellow in color, with a vitreous luster, a specific gravity of 2.569. Its streak is white.
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | C 1 2/c 1 |
| Cell (Å, °) | a = 6.9103, b = 7.634, c = 7.643; α = 90, β = 118.002, γ = 90 |
| Cell volume | 355.992 ų, Z = 4 |
| Axial ratios | 0.9052:1:1.0012calculated from COD 9017863 |
| Source structure | COD 9017863 (American Mineralogist, 2020) — 1 of 16 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.405 | 3.322 | 4.813 | 3.051 | 3.356 | 2.528 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 85.1 | 82.2 | 53.8 | 52.7 | 43.1 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9017863; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.582 g/cm³calculated from COD 9017863 |
|---|---|
| Hardness (Mohs) | 3.5single sourceWikidata (CC0) 3-3.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 2.569 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | gray, white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) |
| Luster | vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 138.38 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Mg 17.56%, S 23.17%, O 57.81%, H 1.46% |
Classification
| Nickel-Strunz (10th) | 7.CB.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 7.CB.05Wikidata (CC0) |