Argentotennantite
Ag6Cu4(Fe,Zn)2As4S13 [CNMNC approved formula]
Named for the chemical composition and by analogy to tennantite.
| IMA status : | Approved Species 1986 (IMA1985-026) |
| CLASSIFICATION | |
| Dana (8th edition) : |
03.03.06.07 |
| (03) Sulfides - Sulfosalts | |
| (03.03) where 3 < z/y < 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals | |
| (03.03.06) Tetrahedrite Group (Isometric: I-43m) | |
| Nickel-Strunz (10th edition) : |
02.GB.05 |
| (02) Sulfides | |
| (02.G) Sulfarsenites, sulfantimonites, sulfbismuthites | |
| (02.GB) Neso-sulfarsenites, etc. with additional S | |
| Crystal system: | Cubic System |
| Point group (H-M): | 43m (or 4 3m) — hextetrahedral |
| Unit cell: | a = 10.584 Å |
| Crystal Habit: | Small grains to 0.1 mm |
| Color: | Gray-black |
| Diaphaneity: | Opaque |
| Luster: | Resinous |
| Hardness (Mohs): | 3.4 |
| Measured Density: | 5.05 (calculated) g/cm3 |
| Fracture: | Conchoidal |
| Streak: | Red-brown to black |
| Polymorphism and Series: | Forms a series with freibergite. |
| Geologic Setting: | In a polymetallic deposit (Kvartsitoviye Gorki deposit, Kazakhstan); in a stratiform Pb–Zn orebody (Silvermines, Ireland). |
| Mineral Association: | Tennantite–tetrahedrite, freibergite, stibnite, mercurian gold, pyrite, galena, siderite, ankerite, quartz (Kvartsitoviye Gorki deposit, Kazakhstan); geocronite, proustite–pyrargyrite, galena (Silvermines, Ireland) |