Safflorite
CoAs2IMA symbol: Safgrandfathered
Safflorite is a sulfide or sulfosalt mineral with the formula CoAs2, crystallizing in the orthorhombic system. It has a Mohs hardness of 4.5-5, typically white or gray in color, with a metallic luster, a specific gravity of 6.9-7.3. Its streak is black or gray; cleavage is perfect.
Photos
As2)_(10974849383).jpg){kind=link}
.jpg){kind=link}
.jpg){kind=link}
Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | P n n m |
| Cell (Å, °) | a = 5.0669, b = 5.8739, c = 3.1346; α = 90, β = 90, γ = 90 |
| Cell volume | 93.293 ų, Z = 2 |
| Axial ratios | 0.8626:1:0.5336calculated from COD 9011400 |
| Source structure | COD 9011400 (Acta Crystallographica, Section E, 2008) |
Powder X-ray diffraction (calculated)
| d (Å) | 2.541 | 2.427 | 2.666 | 1.868 | 1.661 | 1.636 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 99 | 86 | 69.7 | 46.9 | 31.1 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9011400; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 7.411 g/cm³calculated from COD 9011400 |
|---|---|
| Hardness (Mohs) | 4.5-5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 6.9-7.3 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | gray, whitesingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | black, graysingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | metallicsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Cleavage | perfectsingle sourceDana's System, 1st Appendix (1899) |
Chemistry (calculated)
| Molecular weight | 208.78 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Co 28.23%, As 71.77% |
Classification
| Nickel-Strunz (10th) | 2.EB.15aWikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 2.EB.15aWikidata (CC0) |