Celestine
Sr(SO4)IMA symbol: Cltapproved
Celestine is a sulfate mineral with the formula Sr(SO4), crystallizing in the orthorhombic system. It has a Mohs hardness of 3-3.5, typically white or red in color, with a pearly or vitreous luster, a specific gravity of 3.95-3.97. Its streak is white.
Photos
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Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | P n m a |
| Cell (Å, °) | a = 8.389, b = 5.365, c = 6.885; α = 90, β = 90, γ = 90 |
| Cell volume | 309.9 ų, Z = 4 |
| Axial ratios | 1.5637:1:1.2833calculated from COD 5000042 |
| Source structure | COD 5000042 (Vestnik Moskovskogo Universiteta, Geologiya, 1987) — 1 of 10 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.979 | 3.304 | 2.739 | 3.185 | 2.683 | 2.052 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 92.6 | 64.8 | 53.3 | 50.4 | 50.2 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 5000042; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.937 g/cm³calculated from COD 5000042 |
|---|---|
| Hardness (Mohs) | 3.25single sourceWikidata (CC0) 3-3.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 3.95-3.97 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | red, whitesingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) whitesingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | pearly, vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 183.68 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Sr 47.7%, S 17.46%, O 34.84% |
Classification
| Nickel-Strunz (10th) | 7.AD.35Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 7.AD.35Wikidata (CC0) |
| Dana (8th) | 28.3.1.2Wikidata (CC0) |