Unnamed Borate occurrence, Gabilan Range, Monterey Co., California, USA

Fe²⁺₂Fe³⁺(BO₃)O₂

Vonsenite is a rare borate in the Ludwigite group. It is the blue/black colored material intermixed with what appears to be some type of mica.

4 x 2.5 x 1.8 cm

Sold Specimen retained as part of the Minerals Sold But Not Forgotten Galleries