Geerite
Cu8.5S5 [CNMNC approved formula]
Named To honor the original collector, Adam Geer, of Utica, New York, USA.
| IMA status : | Approved Species 1980 () |
| CLASSIFICATION | |
| Dana (8th edition) : |
02.04.07.06 |
| (02) Sulfides - Including Selenides and Tellurides | |
| (02.04) where Am Bn Xp, with (m+n):p=2:1 | |
| (02.04.07) Chalcocite Group ([Cu]2-x S] formulae) | |
| Nickel-Strunz (10th edition) : |
02.BA.05c |
| (02) Sulfides | |
| (02.B) Metal Sulfides, M:S > 1:1 (mainly 2:1) | |
| (02.BA) With Cu, Ag, Au | |
| Crystal system: | |
| Point group (H-M): | |