A very difficult-to-obtain specimen of copper, and a FINE one at that. You just do not see Onganja specimens around - and this one is particularly fine in form and crystallization. It sits on a "base" of a calcite rhomb, completely crystallized rising up from this base in delicate branches. If you like coppers, here is a really good one! Old material from the Gary Hansen Collection (reflective of 1970s-80s dealer stock) 3.4 x 2.7 x 1.6 cm