Leonite
K2Mg(SO4)2·4H2OIMA symbol: Leograndfathered
Leonite is a sulfate mineral with the formula K2Mg(SO4)2·4H2O. It has a Mohs hardness of 2.75, typically white or green in color, a specific gravity of 1.76. Its streak is white.
Photos
Crystallography
| Space group | C 1 2/m 1 |
|---|---|
| Cell (Å, °) | a = 11.986, b = 9.57, c = 9.95; α = 90, β = 85, γ = 90 |
| Cell volume | 1136.98 ų, Z = 4 |
| Axial ratios | 1.2525:1:1.0397calculated from COD 9015944 |
| Source structure | COD 9015944 (Zeitschrift fur Kristallographie, 1939) — 1 of 7 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.442 | 3.54 | 3.359 | 3.559 | 3.084 | 5.323 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 69.9 | 62 | 54.1 | 53.7 | 53.6 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9015944; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.274 g/cm³calculated from COD 9015944 |
|---|---|
| Hardness (Mohs) | 2.75single sourceWikidata (CC0) |
| Specific gravity | 1.76 g/cm3single sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Color | green, whitesingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Streak | whitesingle sourceWikidata (CC0) |
Chemistry (calculated)
| Molecular weight | 366.69 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | K 21.33%, Mg 6.63%, S 17.49%, O 52.36%, H 2.2% |
Classification
| Nickel-Strunz (10th) | 7.CC.55Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 7.CC.55Wikidata (CC0) |