Size 7cm x 5cm
 
Showy small cabinet speciman of emerald green needly  atacamite crystals grown over a black botryoidal mineral, which in turn contrasts nicely with the yellow/brown limonite matrix. The black botryoidal mineral shows no fibrous structure, so is probably a manganese mineral, maybe cryptomelane ? There were areas that were enriched with manganese , some even having small pyrolusite crystals. Mined many years ago during the early days of opencut mining and now hard to come by.