Okurusu Mine, famous for the Fluorites it produced,is an open pit worked from around 1920, hosted in an alkaline igneous carbonatite ring dike complex. Phantoms are perhaps some of the most amazing pieces the deposit has produced.
This specimen shows minimal damage and an absolutely amazing colour - And has not been oiled or exposed to acid! Note that the specimen shows a much stronger green colour, with the purple coming through in strong transmitted light and photography.
The mining of Fluorite globally really took off during the industrial revolution, as it is used as a flux for smelting iron. Coming in many different varieties and colours, some of the most fascinating specimens globally can be traced to this deposit.