Glaucokerinite – Serpieri Mine, Laurion, Attica, Greece
 Type locality!
 Glaucokerinite, also known as copper zinc alumina sulfate, was first discovered in the Serpieri Mine and is a sulfate-class mineral. Glaucokerinite develops only microscopic crystals and is usually found in the form of sky-blue to blue-green banded, grape-like crusts with a drifting, radially fibrous to tabular structure and a waxy luster on the surfaces.
 Rare collector's item.