Formed from acid mine waste waters with mineralogically zoned assemblages in sheltered areas at a relative humidity of 65% and T = 4 °C. Dehydrates to cuprian pentahydrate. Mg-domin ant analog of melanterite.
Approved IMA 2003 (Dana # Added)
Big Mike mine located on the south side of Panther Canyon, on the west flank of the north end of the Tobin Range, Pershing County, Nevada, USA. Link to MinDat.org Location Data.
Named after Charles N. Alpers, geochemist with the United States Geological Survey, who has made significant contributions to our understanding of the mineralogical controls of mine -water geochemistry.