Hanksite
KNa22(SO4)9(CO3)2ClIMA symbol: Hksgrandfathered
Hanksite is a sulfate mineral with the formula KNa22(SO4)9(CO3)2Cl, crystallizing in the hexagonal system. It has a Mohs hardness of 3-3.5, typically white or yellow in color, with a dull or vitreous luster, a specific gravity of 2.562. Its streak is green.
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Crystallography
| Crystal system | hexagonal crystal systemWikidata (CC0) |
|---|---|
| Space group | P 63/m |
| Cell (Å, °) | a = 10.465, b = 10.465, c = 21.191; α = 90, β = 90, γ = 120 |
| Cell volume | 2009.84 ų, Z = 2 |
| Axial ratios | 1.0000:1:2.0249calculated from COD 9000374 |
| Source structure | COD 9000374 (American Mineralogist, 1973) |
Powder X-ray diffraction (calculated)
| d (Å) | 2.786 | 2.616 | 3.814 | 1.907 | 3.532 | 3.425 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 89.1 | 88.1 | 41.8 | 28.6 | 18.9 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9000374; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.586 g/cm³calculated from COD 9000374 |
|---|---|
| Hardness (Mohs) | 3-3.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 2.562 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) greensingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Luster | dull, vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 1564.91 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | K 2.5%, Na 32.32%, S 18.44%, O 42.94%, C 1.54%, Cl 2.27% |
Classification
| Nickel-Strunz (10th) | 7.BD.30Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 7.BD.30Wikidata (CC0) |