IMA formula: Cu(C2O4)(NH3)
Crystallography: Orthorhombic. Pbca. a = 11.1998(10) Å, b = 9.4307(9) Å, c = 8.3977(7) Å. Z = 8.
Edwindavisite is named after Mr. F. Edwin (Ed) Davis, Jr., an Arizona-based mineral collector and the current contractor operator of the Rowley mine. I met Ed at the 2025 Miner’s Co-Op Show in Tucson, and after one year we met again at the same place.
According to literature and Mindat, edwindavisite was only found in a guano-rich area on the 125-ft level of the Rowley mine, where many other organic minerals are present. Edwindavisite is green and transparent when collected, but alters since that. In this sample, one can still see the unaltered area at the corner of the crystals.
According to Ed, the area will not be visited in the near future, which means it is very likely there will not be any new edwindavisite discovered from the locality. Currently only very few samples (<10) were found, with a great portion of them being stored in museums (e.g., the type materials are in the collections of University of Arizona Alfie Norville Gem & Mineral Museum & Natural History Museum of Los Angeles County), which makes this specimen extremely precious. I deeply appreciate Ed for delivering this specimen to me. Thank you Ed!
Copper World 