Home > Copper Minerals II – September 8 > MS1114 Volborthite

Volborthite - Sold

Volborthite is a hydrated copper vanadate. Hess (1838) named the mineral after its discoverer, Aleksandr Fedorovich von Volborth (1800-1876), Russian paleontologist. Volborthite has unusual magnetic properties (Yoshida et al. 2012). In 2011, a few very unusual green crystals came out of the Milpillas mine. Some of these crystals to 2 cm or so, in larger clusters, proved to be volborthite. This is fine example with sharp crystal faces, and a thin rosette like habit. There is a bit of attached clay, which provides a contrast to the bronzy green crystal group.