Glaucodot
(Co0.5Fe0.5)AsSIMA symbol: Glgrandfathered
Glaucodot is a sulfide or sulfosalt mineral with the formula (Co0.5Fe0.5)AsS, crystallizing in the orthorhombic system. It has a Mohs hardness of 5.102, typically white or gray in color, with a metallic luster, a specific gravity of 5.973. Its streak is black; cleavage is perfect.
Photos
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Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | P n 21 m |
| Cell (Å, °) | a = 14.158, b = 5.6462, c = 3.3196; α = 90, β = 90, γ = 90 |
| Cell volume | 265.365 ų, Z = 2 |
| Axial ratios | 2.5075:1:0.5879calculated from COD 9010484 |
| Source structure | COD 9010484 (American Mineralogist, 2008) |
Powder X-ray diffraction (calculated)
| d (Å) | 2.715 | 2.447 | 1.821 | 2.423 | 1.637 | 1.66 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 82 | 75.7 | 72.8 | 40.8 | 30.3 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9010484; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 6.172 g/cm³calculated from COD 9010484 |
|---|---|
| Hardness (Mohs) | 5single sourceWikidata (CC0) 5.102single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 5.973 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | gray, whitesingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | blacksingle sourceWikidata (CC0) blacksingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | metallicsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Cleavage | perfectsingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
Chemistry (calculated)
| Molecular weight | 164.38 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Co 17.93%, Fe 16.99%, As 45.58%, S 19.51% |
Classification
| Nickel-Strunz (10th) | 2.EB.10cWikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 2.EB.10cWikidata (CC0) |