Dark blue-violet tarnish ferrokësterite from the type locality associated with grey metallic arsenopyrite. Cligga Mine, Cligga Head, Cornwall, England, UK.
![](https://jmelville.mineralcollective.com/wp-content/uploads/2023/12/2023-12-09-22-41-57-BR8S4-scaled.jpg)
Dark blue-violet tarnish ferrokësterite from the type locality associated with grey metallic arsenopyrite. Cligga Mine, Cligga Head, Cornwall, England, UK.