This calcite and hydrozincite combo comes from an old Belgian lead/zinc mine near Plombières, Liège province, Belgium. The locality is no...

Very sharp calcite needles that fluoresce a stong greenish white with an equally strong phosphorescence. Clearly some polycyclic aromatic...

Mixture of wurtzite and sphalerite from: Horn Silver Mine, Frisco, San Francisco District, San Francisco Mts, Beaver Co., Utah, USA. When...