Thénardite
Na2(SO4)IMA symbol: Thnrenamed
Thénardite is a sulfate mineral with the formula Na2(SO4), crystallizing in the orthorhombic system. It has a Mohs hardness of 2-3, typically white or brown in color, with a vitreous luster, a specific gravity of 2.68-2.69. Its streak is white.
Photos
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Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | F d d d :2 |
| Cell (Å, °) | a = 9.829, b = 12.302, c = 5.868; α = 90, β = 90, γ = 90 |
| Cell volume | 709.537 ų, Z = 8 |
| Axial ratios | 0.7990:1:0.4770calculated from COD 9004092 |
| Source structure | COD 9004092 (The Canadian Mineralogist, 1975) — 1 of 2 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.786 | 4.663 | 2.648 | 1.865 | 3.18 | 3.075 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 53.9 | 44.8 | 43.7 | 41 | 36.9 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9004092; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.659 g/cm³calculated from COD 9004092 |
|---|---|
| Hardness (Mohs) | 2-3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 2.68-2.69 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | brown, whitesingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) |
| Luster | vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 142.04 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Na 32.37%, S 22.57%, O 45.06% |
Classification
| Nickel-Strunz (10th) | 7.AC.25Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 7.AC.25Wikidata (CC0) |