From: Mina Miguel Vacas, Vila Viçosa, Évora, Portugal.
 
 
Sample measuring 3.5 x 3.0 x 2.5 cm and weighing 27 grams, containing short, bipyramidal, dark green, prismatic, submillimeter-sized, dark green Libethenite crystals with a vitreous luster. It was generated in a supergene enrichment zone of a copper deposit, along with other copper phosphates and carbonates (pseudomalachite, malachite, etc.).