Description

#2010 – A 3.9 x 2.9 x 1.1-inch plate of Dark green gemmy Fluorite from the Lady Annabella Mine. Eastgate, Weardale, County Durham, England.  This specimen also fluoresces a bright light purple color.  The fluorite at the Lady Annabella Mine originated from hydrothermal fluids circulating through fractures in the Great Limestone during the Devonian era, likely influenced by a nearby granite intrusion. These hot, mineral-rich brines moved upward through the existing fault systems, including the splay shear that hosts the mine, causing minerals like fluorite to precipitate and crystallize in the resulting cavities and breccias as temperature and pressure conditions changed.