5.9" Botryoidal Smithsonite Formation - San Giovanni Mine, Italy

This is a beautiful specimen of botryoidal smithsonite that likely formed as a pseudomorph after calcite. It comes out of the San Giovanni mine in Sardinia, Italy, and measures 5.9" wide. The layers of smithsonite are visible near one edge and along the periphery of the specimen.

It comes with an acrylic display stand.

Smithsonite forms in earthy botryoidal masses, sometimes forming grape-like structures. It can be found as a secondary mineral in oxidation zones of zinc ore deposits, in some sedimentary deposits, and as an oxidation product of sphalerite. The general chemical formula of smithsonite is ZnCO3, however Fe (iron), Mg (magnesium), Ca (calcium), Cd (cadmium), Cu (copper), and Co (cobalt) can take the place of Zn (zinc). This potential for elemental variation results in smithsonite's wide variety of colors, including blue, green, yellow, orange, pink, purple, brown, gray, white, and colorless.

San Giovanni Mine, Iglesias, South Sardinia Province, Sardinia, Italy
5.9 x 5"