Copiapite [Fe.sup.2+][[Fe.sup.3+].sub.4]+[([SO.sub.4]).sub.2] 20[H.sub.2]O
Copiapite and its Al and Mg-analogs, aluminocopiapite and magnesiocopiapite, are relatively common secondary minerals in old workings of the Andrassy I, II and the Vilmos sections.
In laboratory leaching studies he reported the following sulfates: jarosite, alunite, melanterite, copiapite and yavapaiite.
Excellent voltaite, metavoltine, melanterite, copiapite and halotrichite, have been found at outcrops of pyritic Chattanooga Shale in Kentucky and at roadcuts exposing pyritic coal beds in Kentucky, Tennessee, and Pennsylvania (e.g., Coskren, 1981).
On level 33 it is extremely common in octahedral crystals to 3 mm on halotrichite, pink coquimbite, red botryogen, blue chalcanthite, brown jarosite, yellow copiapite
and many other complex sulfates .