Location: |
Shullsburg area, Southwest Wisconsin, USA |
Major Minerals: |
Sphalerite, pyrite, marcasite, galena |
Minor Minerals: |
Chalcopyrite |
Trace Minerals: |
Include millerite and enargite |
Textures: |
The sulphides infill open spaces. Pyrite is disseminated or forms radiating banded intergrowths with marcasite. Sphalerite has delicate colour banding related to its iron content (darker bands are iron-rich) that can be correlated across the deposit. Sphalerite is intergrown with pyrite/ marcasite or with galena. Galena forms euhedral crystals within the centre of vugs. Pyrite and marcasite are replaced by sphalerite and galena |
References: |
McLimans et al., 1980; Craig et al., 1983; Craig and Vaughan, 1986 |