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Nentsberry Haggs æšæ¬ã¯äžè¬ã«å®ç³ã®ãããªåäžçµæ¶ãšãããããã建ç¯çãªæ§é ãç¹åŸŽãšããŸããæãåªããæšæ¬ã«ã¯ãç¹°ãè¿ãããæç¶ã®ãã¡ã³ãæ§ã®ç©ã®ãããªã¯ã©ã¹ã¿ãŒãããŒãããç³ç°å²©ããã©ã€ãããŠã£ã¶ãŒã©ã€ãããŸãã¯æ¹è§£ç³ã«å¯ãã ãããªã¯ã¹äžã«éãªããã¬ãŒããèŠãããŸããæãæãŸããäŸã§ã¯ãéãçµç«¯ãã¯ã£ãããšããèµ·äŒã衚é¢äžã®éææããããŒè²ãSecond Sun Vein ã Admiralty Concession Flat ãžã®æç¢ºãªé¢é£æ§ãä¿ãããŠããŸãã## Featured Specimens
Search for specimens: View all barytocalcite specimens from Nentsberry Haggs Mine, UK
Nentsberry Haggs Mine lies near Nenthead, between Nenthead and Alston, on Alston Moor in Cumbria, England. The principal portal is on the north side of the Nenthead-to-Alston road, west of Nentsberry Bridge. The mine is also known in the literature and old plans as Nentsberry Mine, Nentsbury Mine, Haggs Mine, and Nentsberry Haggs Mine, a naming tangle made worse by the workings crossing the Cumbria-Northumberland boundary.
The deposit is part of the Northern Pennine Orefield, within the Alston Block. The mine worked lead and later zinc, with sphalerite and galena as the chief ore minerals in the relevant flat workings. The barytocalcite specimens came especially from the Admiralty Concession Flat, a strata-bound replacement body developed in the Great Limestone at the west end of the Second Sun Vein. The flat was reached by rises from the horse level where the Second Sun Vein is exposed as a shatter belt several metres wide. The workings were developed on two principal horizons: a smaller upper level at the High Flat Horizon below the Tumbler Beds, and a much longer lower level probably at the Middle Flat Horizon.
The geological setting is crucial to understanding the specimens. Dolomitisation and later iron-rich carbonate alteration produced porous, cavernous limestone adjacent to the vein. Brecciation and limestone dissolution enlarged cavities, many of which were lined with drusy quartz, âankerite,â sphalerite, and galena before the barium minerals arrived. In the lower flat, baryte was deposited first, in some places as large blades. Later dissolution of baryte produced corroded crystals, voids, and epimorphic shapes, then barium carbonate minerals â chiefly barytocalcite, with witherite and some alstonite â formed in and around those spaces. A final hydrothermal alteration stage coated or partly replaced many barium carbonates with a white microcrystalline crust of baryte and calcite.

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