Glaukokerinite – Serpieri Mine, Laurion, Attica, Greece
 Type locality!

 Glaucocerinite, also known as copper-zinc alumina sulfate, was first discovered in the Serpieri Mine and is a sulfate-class mineral. Glaucocerinite forms only microscopic crystals and is usually found as sky-blue to blue-green banded, botryoidal crusts with a diverging, radially fibrous to tabular structure and a waxy luster on the surfaces.
 Rare collector's item.