Scheelite
Ca(WO4)IMA symbol: Schgrandfathered
Scheelite is a sulfate mineral with the formula Ca(WO4), crystallizing in the tetragonal system. It has typically colorless, brown, orange or yellow in color, a calculated density of 6.261 g/cm3. Its streak is white.
Photos
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Crystallography
| Crystal system | tetragonal crystal systemWikidata (CC0) |
|---|---|
| Space group | I 41/a :2 |
| Cell (Å, °) | a = 5.205, b = 5.205, c = 11.275; α = 90, β = 90, γ = 90 |
| Cell volume | 305.46 ų, Z = 4 |
| Axial ratios | 1.0000:1:2.1662calculated from COD 1546034 |
| Source structure | COD 1546034 (Journal of Physics and Chemistry of Solids, 2006) — 1 of 10 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.082 | 4.726 | 1.912 | 1.58 | 3.047 | 2.603 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 62.7 | 29.5 | 25.7 | 21.9 | 19.4 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 1546034; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 6.261 g/cm³calculated from COD 1546034 |
|---|---|
| Color | brown, colorless, orange, yellowDana's System, 2nd Appendix (1909) |
| Streak | whitesingle sourceWikidata (CC0) |
Chemistry (calculated)
| Molecular weight | 287.92 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Ca 13.92%, W 63.85%, O 22.23% |
Classification
| Nickel-Strunz (10th) | 7.GA.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 7.GA.05Wikidata (CC0) |