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åç: James St. John / Wikimedia Commons
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åç: Rob Lavinsky / Wikimedia Commons
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Search for specimens: View all arsenopyrite specimens from Panasqueira Mines, Portugal
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Panasqueira arsenopyrite is common enough that representative specimens remain available, but truly fine pieces are not common. The market ranges from inexpensive small clusters and mixed sulfide miniatures to high-end cabinet specimens with exceptional luster, complete form, old provenance or important associations. Recent dealer and auction examples show the breadth: modest miniatures can trade at entry-level prices, while sculptural small-cabinet clusters and old collection pieces may reach the high hundreds or low thousands of dollars, especially when undamaged and visually dramatic.
The main authenticity issue is locality confidence rather than synthetic arsenopyrite. Arsenopyrite itself is not a species that is routinely faked in the way brightly dyed agates, coated quartz or lab-grown novelty crystals are. The practical risks are repaired clusters, composite assemblies, vague labels, and Panasqueira attribution given to arsenopyrite from another locality because âPanasqueiraâ is the more desirable name. A genuine Panasqueira arsenopyrite should make mineralogical sense: quartz, muscovite, siderite, fluorapatite, cassiterite, pyrite, chalcopyrite, topaz, fluorite or wolframite associations are all plausible, but the structure should show natural growth contacts rather than glue lines or mismatched matrix.
Natural iridescence deserves special mention. Some Panasqueira arsenopyrites display colorful surface films in purple, blue, green, magenta or bronze tones under strong lighting. These are not automatically suspect. The collectorâs test is not simply âis it colorful?â but whether the color follows natural crystal surfaces, whether it is consistent with the specimenâs exposure and mineral coating, and whether there is any evidence of artificial metallic coating, paint, oil or residue.
Condition problems are more common than outright fakery. Check the high points of cockscomb clusters with a loupe; tiny chips can be visually masked by the brightness of the crystal faces. Inspect contact points where crystals meet the matrix. Look for suspiciously glossy glue in recesses, blue-white fluorescence from modern adhesives under longwave UV, and broken arsenopyrite blades reattached at unnatural angles. Heavy arsenopyrite specimens can also be vulnerable in shipping because dense metallic clusters concentrate stress at narrow attachment points.
Storage is simple but should be thoughtful. Arsenopyrite is an arsenic-bearing sulfarsenide, FeAsS, and should be treated as a mineral specimen rather than handled casually. Keep it dry, avoid grinding or trimming without proper precautions, wash hands after handling, and keep loose fragments or dust away from children, pets and food-preparation areas. Normal display in a closed cabinet is appropriate for stable specimens.## Stories & Field Notes
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æšæ¬ã®ç©èªã¯ãé±å€«ããrotosïŒç©ŽïŒããšåŒã¶æŽçªçšèªãšåã£ãŠãåããªãé¢ä¿ã«ãããŸãããããã®éå£éšã¯ãã»ã³ãã¡ãŒãã«ã¹ã±ãŒã«ããã¡ãŒãã«ã¹ã±ãŒã«ãŸã§å€åããããã¹ã±ã€ã©ãåãªãé±ç³åºããå žåçãªé±ç©ç£å°ãžãšå€ããå Žæã§ããå°äžäœæ¥ãé²ãã«ã€ããŠäºæž¬äžèœã«çŸããŸããã²ãšã€ã®ã¹ããŒãã¯ãèç¶ã®ç³è±ãšé±ç³ããèŠããªããããããŸããïŒå¥ã®ã¹ããŒãã¯ãç³è±ãæŸç°ç³ãéå±ç¡«åç©ãçç°ç³ãã¿ã³ã°ã¹ãã³é±ç³ã§è£æã¡ããããã±ãããžãšéãããšããããŸããæè¯ã®ç é鱿šæ¬ã¯ãã±ããã®çåè ã§ãããç ããããã«ã®é£Œæã§ã¯ãªããéæŸç©ºéã§ã®çµæ¶æé·ã®ç¬éãéãéå± edge ãä¿ã£ãŠé±å±±ããåãåºããæçã§ãã## é±ç©åŠçèšé²ãšåè¡ç©- W. C. Kelly and R. O. Rye, âGeologic, fluid inclusion, and stable isotope studies of the tin-tungsten deposits of Panasqueira, Portugal,â Economic Geology, 74(8), 1721â1822, 1979 â Panasqueiraã®å°è³ªåŠãæµäœå æç©ãå®å®åäœäœããã³çžé¢çæã®å€å žçãªåºç€ç ç©¶ã
R. W. Bussink, R. Kreulen and A. F. M. de Jong, âGas analyses, fluid inclusions and stable isotopes of the Panasqueira W-Sn deposits, Portugal,â Bulletin de Minéralogie, 107, 703â713, 1984 â Panasqueiraã®é±ç³æµäœãšå®å®åäœäœèšŒæ ã«é¢ããéèŠãªè¿œè·¡ç ç©¶ã
D. Wimmers, âSilver minerals of Panasqueira, Portugal: a new occurrence of Te-bearing canfieldite,â Mineralogical Magazine, 49(354), 745â748, 1985 â ç¹ã«åžå°ãªéããã³ãã«ã«ãå«ãçžã«é¢å¿ã®ããã³ã¬ã¯ã¿ãŒåãã®éèŠãªç¡«åç©çžã®é±ç©åŠã
D. A. Polya, âEfficiency of hydrothermal ore formation and the Panasqueira W-Cu(Ag)-Sn vein deposit,â Nature, 333, 838â841, 1988 â æ°Žç±ç³»ãWãCuãSnãZnãã©ãã ãå¹ççã«æ¿éãããã®ç°¡æœãªå®éç解説ã
A. Campbell, S. Robinson-Cook and C. Amindyas, âObservation of fluid inclusions in wolframite from Panasqueira, Portugal,â Bulletin de Minéralogie, 111, 515â526, 1988 â äžéæãªæåã® wolframite ã«å æç©ãèµ€å€é¡åŸ®é¡ã§èгå¯ããç¹ã§ notableã
Carles Curto Milá and Jordi Fabre, âThe Panasqueira mines, Castelo Branco district, Portugal,â The Mineralogical Record, 45(1), 11â55, 2014 â çŸä»£ã®ã³ã¬ã¯ã¿ãŒå¿åã® locality monograph ã®å¿ æºæžã
António Mateus, Jorge Figueiras, Ivo Martins, Pedro C. Rodrigues and Filipe Pinto, âRelative Abundance and Compositional Variation of Silicates, Oxides and Phosphates in the W-Sn-Rich Lodes of the Panasqueira Mine (Portugal),â Minerals, 10(6), 551, 2020 â é±ç©ã®åž¯ç¶ååžãé±èéåäœãããã³é±ç³åœ¢æéçšã®çŸä»£ç詳现ç ç©¶ã
I. Martins, A. Mateus, J. Figueiras, P. Rodrigues and F. Pinto, âThermal evolution of the W-Sn(-Cu) Panasqueira ore system (Portugal): Insights from pyrite-pyrrhotite and arsenopyrite geothermometers,â Comunicações Geológicas, 107, Special Issue 2, 69â74, 2020 â é»éé±-é»éé±é¡ãšç éé±ã®ç±èšæž¬æž©åºŠèšãçšããŠãé±åºã®ç±çé²åãå¶çŽããçŽæ¥çãªé¢é£ã
Michel Cathelineau, Marie-Christine Boiron, Christian Marignac, Maxime Dour, Mélanie Dejean, Eleonora Carocci, Laurent Truche and Filipe Pinto, âHigh pressure and temperatures during the early stages of tungsten depositiPanasqueira ã§ã®æµäœå æç©ã«ãã£ãŠæããã«ãªãããšã瀺ããã髿ž©ã¬ã©ã¹: Ore Geology Reviews, 2020 â æ·±éšã®æ®çºæ§è±å¯ãªæµäœãå«ãåææ®µéã®å§å-枩床æ¡ä»¶ã®çŸä»£çåè©äŸ¡ã
Mindat ã®äºäŸèšé²ïŒãã«ãã¬ã« Panasqueira é±å±±ã®ç éé± Arsenopyrite â æš©ååéå®¶åãã®é±ç©ããŒã¿ãåŒçšæç®ãåçã®ã£ã©ãªãŒãžã®ã¢ã¯ã»ã¹ãæäŸããèšé²ã
Wikimedia CommonsïŒãArsenopyrite (Panasqueira, Portugal).jpgã, James St. John, Cleveland Museum of Natural History æšæ¬ CMNH 11477 â 倧éäœããéåäœãŸã§ã® Panasqueira ã®ç éé±ãèå¥ããã®ã«æçšãªå ¬åŒã®åç©é€šæšæ¬ç»åã
Wikimedia CommonsïŒãArsenopyrite-121247.jpgã, Rob Lavinsky / iRocks â ã·ã£ãŒãã§çžç¶ã® Panasqueira ã®ç éé±ãšé²æ¯ã®çµã¿åããã瀺ãå€å žçãªå°ããªæšæ¬ç»åã## Further Reading & External Links
Mindat: Panasqueira Mines, Portugal â äžå¿ãªã³ã©ã€ã³ã®ããŒã«ãªãã£åç §ãé±ç©ãªã¹ããããŒã«ãªãã£éå±€ãå°è³ªèŠçŽãåçãšåŒçšæç®ã
Mindat: Arsenopyrite from Panasqueira Mines, Portugal â ããŒã«ãªãã£ã«ããã arsenopyrite ã®çš®ç¹ç°çåºçŸããŒãžã
Almonty Industries NI 43-101 Technical Report on the Panasqueira Mine, Portugal â æ¡é±å²ãçç£ãå°è³ªãé±åãåŠçã»ã€ã³ãã©ã«é¢ããçŸä»£ã®æè¡ç詳现ãœãŒã¹ã
ProGEO Portugal Geosite: Minas da Panasqueira â åœã®éèŠ geosite ãšããŠã®é±å±±ã®ç°¡æœãªå°è³ªã»å ±çåŠçæŠèгã
Britannica: Panasqueira â é±å±±ã®æŠç¥çæŠææçŸ©ãå«ãç°¡æœãªæŽå²æŠèгã
Mineralogical Record Vol. 45 No. 1, 2014 â Carles Curto Milá ãš Jordi Fabre ã«ããå€§èŠæš¡ãª Panasqueira ããŒã«ãªãã£èšäºã®ããã¯ã€ã·ã¥ãŒé ã
ResearchGate abstract: âFamous mineral localities: The Panasqueira Mines, Castelo Branco District, Portugalâ â æšæ¬èšé²èšäºã®èŠçŽã§ãè¿ éãªã³ã¬ã¯ã¿ãŒåãæŠèŠã«æçšã
Fabre Minerals: Reference specimens from Panasqueira, Portugal â ããŒã«ãªãã£ã®é«çŽæšæ¬ã¹ã¿ã€ã«ãšè€æ°çš®çµã¿åããã瀺ããã£ãŒã©ãŒã®åç §ã¢ãŒã«ã€ãã
Marin Mineral Company: Arsenopyrite from Panasqueira Mines â ããŒã«ãªãã£ã®åç㪠bow-tie arsenopyrite ã¯ã©ã¹ã¿ãŒã®äŸ¡æ Œã»ãµã€ãºã»ç£å°ã瀺ãã¢ãŒã«ã€ãåã
Mineral Auctions: Arsenopyrite classic locality, Panasqueira Mines â ããŒã«ãªãã£ããã®çŸåå°åãã£ãããã arsenopyrite ã®åžå ŽéèŠã瀺ãèœæèšé²ã