Gersdorffite
NiAsSIMA symbol: Gdfrenamed
Gersdorffite is a sulfide or sulfosalt mineral with the formula NiAsS, crystallizing in the cubic system. It has a Mohs hardness of 5.5, typically white, black or gray in color, with a metallic luster, a specific gravity of 5.6-6.2. Its streak is black or gray.
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Crystallography
| Crystal system | cubic crystal systemWikidata (CC0) |
|---|---|
| Space group | |
| Cell (Å, °) | a = 5.645, b = 5.645, c = 5.645; α = 90, β = 90, γ = 90 |
| Cell volume | 179.9 ų |
| Source structure | COD 1010750 (University of Toronto Studies, Geological Series, 1940) — 1 of 3 structures |
Physical properties
| Hardness (Mohs) | 5.5single sourceWikidata (CC0) 5.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
|---|---|
| Specific gravity | 5.6-6.2 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | black, 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) |
Chemistry (calculated)
| Molecular weight | 165.68 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Ni 35.43%, As 45.22%, S 19.35% |
Classification
| Nickel-Strunz (10th) | 2.EB.25Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 2.EB.25Wikidata (CC0) |
| Dana (8th) | 2.12.3.2Wikidata (CC0) |