Tarnowitzite

Tarnowitzite, Tsumeb Mine, Namibia

Well-formed, terminated crystals of the rare, lead-based variety of aragonite (also known as 'Tarnowitzite'), presenting compositional banding from white to colorless/translucent.  Fluoresces pastel aqua blue at 320 nm.  

Dimensions: 15 x 15 x 17 mm.