Argyrodite
Ag8GeS6IMA symbol: Agygrandfathered
Argyrodite is a sulfide or sulfosalt mineral with the formula Ag8GeS6, crystallizing in the orthorhombic system. It has a Mohs hardness of 2-5, typically gray, red or violet in color, with a metallic luster, a specific gravity of 6.085-6.111. Its streak is black or gray.
Photos
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Crystallography
| Crystal system | orthorhombic crystal systemWikidata (CC0) |
|---|---|
| Space group | P n a 21 |
| Cell (Å, °) | a = 15.149, b = 7.476, c = 10.589; α = 90, β = 90, γ = 90 |
| Cell volume | 1199.25 ų, Z = 4 |
| Axial ratios | 2.0264:1:1.4164calculated from COD 9009692 |
| Source structure | COD 9009692 (Monatshefte fur Chemie, 1977) |
Powder X-ray diffraction (calculated)
| d (Å) | 3.054 | 2.698 | 1.877 | 3.08 | 2.481 | 3.219 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 65.6 | 38.4 | 32.5 | 31.8 | 30.2 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9009692; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 6.247 g/cm³calculated from COD 9009692 |
|---|---|
| Hardness (Mohs) | 2-5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 6.085-6.111 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | gray, red, violetsingle 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 | 1127.98 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Ag 76.5%, Ge 6.44%, S 17.06% |
Classification
| Nickel-Strunz (10th) | 2.BA.70Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 2.BA.35Wikidata (CC0) |