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Search for specimens: View all fluorite specimens from St Peters Mine, UK
St Peters Mine is at Sparty Lea, East Allendale, Northumberland, with the recorded mine position around NY8515 4876. The mine lies in the North Pennines, a region whose ore deposits are dominated by veins and flats in Carboniferous sedimentary rocks. In practical specimen terms, this means St Peters fluorite is not a simple open-vein product alone: much of the mineâs importance comes from replacement mineralization in limestone, especially in the Great Limestone, where the vein and flat system created cavities and mineralized zones capable of producing crystallized fluorite.
St Peterâs Vein trends roughly east-northeast and was worked as a lead-bearing structure. Geological descriptions record a small but significant fault throw, increasing northeast of the shaft, and a productive ore zone confined to the Great Limestone. Trials in other limestone horizons found fluorite but not payable lead values. The ore-bearing ground in the Great Limestone extended for about 3,400 ft, with both vein oreshoots and flats. The flats occur at the High Flat horizon and were controlled by bedding, minor strings, and the structural form of an elongate domal fold south of the vein. That structural detail matters to collectors because it explains the combination of vein mineralogy, replacement textures, and open-space crystallization seen on St Peters specimens.
The principal ore was galena, with small quantities of sphalerite and pyrite. The gangue suite included green and purple fluorite, quartz, ankerite, siderite, and calcite. These minerals were involved in replacement of the limestone, and the mineâs specimen suite still reflects that paragenesis: fluorite with quartz and siderite is more characteristic than fluorite alone, while galena, calcite, and occasional sphalerite or pyrite belong to the wider St Peters assemblage.
The St Peters deposit was discovered in 1902 during the driving of Blackett Level. It was initially thought to be a continuation of Swinhope Vein, and early development was from Blackett Level before later working from St Peters Shaft. The Weardale Lead Company subsequently worked the mine, and historical accounts place the main industrial life of the mine in the first half of the twentieth century, ending in the mid-1940s. Ore from St Peters was taken to Sipton Mill for treatment, tying the mine physically and operationally to the wider East Allendale mining system.æ¡éã¢ã¯ã»ã¹ã¯ãé©åãªèš±å¯ãšèœåãæŽã£ãŠããªãéãééãšã¿ãªãã¹ãã§ããé±å±±ã¯ç§æå°ã«ãããå°äžã®äœæ¥ã¯å€ãæ·±ãå±éºã§ããã»ã³ãã»ããŒã¿ãŒãºã¯ã«ãžã¥ã¢ã«ãªçŸå°æ¡éå°ã§ã¯ãããŸãããæµéããŠããã»ãšãã©ã®æšæ¬è³ª fluorite ã¯ãæŽå²çãªæ¡æãæ§åéç©ããŸãã¯ç®¡çãããæšæ¬ååäœæ¥ããæ¥ãŠããŸããã shaft ããã® materialãã30 Fathom LevelããŸãã¯1990幎代ã®äœæ¥ãæãçŸä»£ã®ã©ãã«ã¯ãã£ãšããããéèŠã§ãããæ³šæãèŠããŸããããããããåŸã®åž°å±ãé床ã«å ·äœçã«ãªãåŸãå žåç㪠locality ã ããã§ãã
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St Peters attributionãå«ããgalenaïŒæ¹éé±ïŒäžã®èç³ã«ã€ããŠãRalph SutcliffeãLindsay GreenbankãAl and Sue Liebetrau ãšãã£ã人ç©ã«çµã³ã€ãã©ãã«ãå«ãè€æ°ã®å°æ¬ãããã³ã¬ã¯ã·ã§ã³ãçµç±ããŠããèç³ãå·¡ããææžåãããã³ã¬ã¯ã¿ãŒéã®è°è«ããããŸããRock Currierã«ããMindatã®åçã§ã¯ã1972幎㫠Carnegie Museum of Natural History ãžåãæšæ¬ã瀺ãããWilliam Jefferis ã³ã¬ã¯ã·ã§ã³ãšãããŠããŸãããJefferis ã¯1906å¹Žã«æ²¡ããŠããããã®æç¹ã§St Petersã¯ãŸã çŸåœ¹ã®å®å段éã«å ¥ã£ãã°ããã ã£ããããSt Peters attribuion ã¯éåžžã«çããããªããŸãããæèšã¯ããã¹ãŠå€ãã©ãã«ãééã£ãŠãããšããããšã§ã¯ãªããSt Peters ã®ã©ãã«ã¯å¹Žä»£çã»é±ç©åŠçã«æŽåæ§ãæã€ã¹ãã ãšããããšã§ãã
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ãããã幎代é ããã®è©±ãæ©ãŸãå§ããŸãããMindat ã§ãåé家㯠Rock Currier ãæ®åœ±ããåãæšæ¬ã®åçã1972幎çã§èŠã€ããŸããããã®æãæšæ¬ã¯ãããããŒã°ã® Carnegie Museum of Natural History ã«ãããWilliam Jefferis ã³ã¬ã¯ã·ã§ã³ã«å±ãããš attributed ãããŠããŸãããJefferis ã¯19äžçŽã®éèŠãªã¢ã¡ãªã«ã®ã³ã¬ã¯ã¿ãŒã§ã圌ã®ã³ã¬ã¯ã·ã§ã³ã¯1906å¹Žã®æ»åŸã«åç©é€šãžå ¥ããŸãããããã St Peters Vein ã¯1892幎ã«åããŠçºèŠãããŠãããé±å±±ã®å®è³ªçãªéçºã¯ãã以éã§ãããJefferis ãéããŠãã§ã«å€ãã¢ã¡ãªã«ã®çŸè¡é€šã³ã¬ã¯ã·ã§ã³ãžå ¥ã蟌ãã æšæ¬ãã1930幎代äžé ã® St Peters ã®ãããã®ç·è²ã®æšæ¬ã®1ã€ããããã¯1990幎代ã®åååã§ãããšã¯å¿å°ãã説æã§ããŸããã§ãããçµè«ã¯ããã³ããã¯ã§ã¯ãªããæçšã§ããïŒãã®æšæ¬ã¯ããããåãã³ãã€ã³ãºã®çŽ æŽãããèç³ã§ãåŸã® St Peters ã® attributed ãæ¡éã®é£éã®ã©ããã§ä»çãããã®ã ã£ãã®ã§ãããã
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Dunham, K. C. 1990. Geology of the Northern Pennine Orefield, Volume I: Tyne to Stainmore, 2nd ed. British Geological Survey. â St Peterâs VeinãGreat Limestoneã®é±åºåºåãå¹³å°ãé±ç©ç³»ãé±å£ãæ§é çå¶åŸ¡ã®å¿ é å°è³ªè§£èª¬ã
Fisher, Jesse. 2020. âFluorite From the North Pennines Orefield England.â Rocks & Minerals 95(4): 306â347. â åéšãã³ãã€ã³ãºèç³ã«é¢ããäž»èŠãªçŸä»£è«æãSt Petersã®ãªã³ãŽ-ç·è²çºèŠã«é¢ããRussellé¢é£ããŒãã«ãåŒçšã
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Smith, Stanley. 1923. Lead and Zinc Ores of Northumberland and Alston Moor. Special Reports on the Mineral Resources of Great Britain, Vol. XXV. â ããŒã¹umberlandãšAlston Moorã®çŸä»£é±ç©è³æºåèè³æãšããŠã®å°è³ªèª¿æ»å ±åã
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