Argentopentlandite
Ag(Fe,Ni)8S8 [CNMNC approved formula]
Named for its silver content and similarity in composition to pentlandite.
| IMA status : | Approved Species 1977 (IMA1970-047) |
| CLASSIFICATION | |
| Dana (8th edition) : |
02.07.01.02 |
| (02) Sulfides - Including Selenides and Tellurides | |
| (02.07) where Am Bn Xp, with (m+n):p=9:8 | |
| (02.07.01) Pentalndite Group (Isometric: Fm3m) | |
| Nickel-Strunz (10th edition) : |
02.BB.15a |
| (02) Sulfides | |
| (02.B) Metal Sulfides, M:S > 1:1 (mainly 2:1) | |
| (02.BB) With Ni, Fe | |
| Crystal system: | Cubic System |
| Point group (H-M): | m3m (or 4/m 3 2/m) — hexoctahedral |
| Unit cell: | a = 10.521 Å |
| Crystal Habit: | Euhedral crystals with well developed octahedral faces; massive |
| Color: | Bronze-brown |
| Diaphaneity: | Opaque |
| Luster: | Metallic |
| Hardness (Mohs): | 3 to 3.5 |
| Measured Density: | 4.66 (calculated) g/cm3 |
| Cleavage: | 1; Well developed on {111} |
| Streak: | Reddish brown |
| Geologic Setting: | In pyrite and cubanite-chalcopyrite hydrothermal veins in ultramafic rocks and in skarn; in hydrothermal veins in acidic volcanics; rare in carbonatites. |
| Mineral Association: | Pyrite, pyrrhotite, mackinawite, cubanite, chalcopyrite, stannite, galena, sphalerite, calcite, quartz |
| Synonyms/varieties: | IMA1970-047 |