Weight- 150 grams
The Bull Vein
Lady Annabella Mine
East gate, Weardale, Co. Durham
England
Discovered- August 2020
Named after Fred Bull, a well-known mineral collector who alerted UK Mining Ventures to the presence of good yellow fluorite in this, until then, unnamed vein.
The central part of the vein is characterised by a prominent northeast trending strike-slip fault continuing into the immediate overlying limestone cap rock with en echelon, carbonate filled tension gashes displayed along its plane.
Blocks of limestone exhibit tilting and collapse towards the central fracture and mosaic breccias with abundant large cavities are well-developed adjacent and to either side of the main fracture core, becoming smaller and "ribbon" shaped towards the periphery of the breccia.