Marcasite on Ferberite

Dimensions: 3.1 x 2 Ht 2.8cm
 Locality: Tazna Mine, Cotagaita, Nor Chichas Province, Potosí, Bolivia
 A remarkable thumbnail, perfect presentation very aesthetic for this marcasite harmoniously arranged on a Ferberite crystal (Hübnerite group)
 The mineral is not glued to the base.