Miargyrite
AgSbS2IMA symbol: Maygrandfathered
Miargyrite is a sulfide or sulfosalt mineral with the formula AgSbS2, crystallizing in the monoclinic system. It has a Mohs hardness of 2-2.5, typically black or gray in color, with a metallic luster, a specific gravity of 5.1-5.3. Its streak is red.
Photos
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | C 1 2/c 1 |
| Cell (Å, °) | a = 12.862, b = 4.409, c = 13.218; α = 90, β = 98.48, γ = 90 |
| Cell volume | 741.379 ų, Z = 8 |
| Axial ratios | 2.9172:1:2.9980calculated from COD 9002733 |
| Source structure | COD 9002733 (American Mineralogist, 2002) — 1 of 3 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.889 | 3.439 | 2.747 | 2.012 | 1.97 | 3.18 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 87.5 | 52 | 31.8 | 31.2 | 26.7 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9002733; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 5.264 g/cm³calculated from COD 9002733 |
|---|---|
| Hardness (Mohs) | 2-2.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 5.1-5.3 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | black, graysingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | redsingle sourceWikidata (CC0) redsingle sourceFord, Dana's Textbook of Mineralogy, 3rd ed. (1922) |
| Luster | metallicsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 293.76 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Ag 36.72%, Sb 41.45%, S 21.83% |
Classification
| Nickel-Strunz (10th) | 2.HA.10Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 2.HA.10Wikidata (CC0) |