English: :Locality: Serra da Mina, Cercal, Evora District, Portugal
Class: Crystals on Matrix
Size: 5 × 3.5 × 3 cm
Description: This is a very rich corkite specimen formed by several extremely brilliant and lustrous crystals, peppering a colorfull goethite matrix. Corkite is an uncommon, low-temperature, secondary mineral occurring in the oxidised zones of hydrothermal base-metal deposits. Really amazing under loupe.