Sewardite (ex Terry Szenics)

Item Description

A hard to find specimen of the rare calcium iron arsenate Sewardite from the locality at Benjamin Hill, Sonora, Mexico. It features reddish colored crystals on host rock matrix. This mineral named for Terry Maxwell Seward a Canadian geochemist, Professor of Geochemistry, Institut fur Mineralogie und Petrographie, ETH (Swiss Federal Institute of Technology), Zurich, Switzerland. I realize that Sewardite and Carminite can't be distinguished by eye, but this piece comes to us from Terry Szenics, whose label states that it was identified by Marcus Origlieri at the University of Arizona in Tucson, so I trust it's genuine.