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Search for specimens: View all cuprite specimens from Chessy copper mines, France
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Chessy ã§ã®æ³šç®ãã¹ãçºèŠã«ã¯ãæéè²ã®éé é é±ãé±å±±ã®è±ããäžžã¿ã垯ã³ãããžã¥ãŒã«ãšçç¶éåäœãéãéé é é±ã®çµæ¶ãé éé±ã®çµæ¶ãé éé±åœè±¡äœåŸã®åéç³ãé éé±åœè±¡äœåŸã®çããéé é é±ãæããããŸããã¯ã©ã·ãã¯ãªé é鱿šæ¬ã¯éåžžã¯ãµã ãã€ã«ãµã€ãºã§ãïŒé éé±ã®çµæ¶ãèµ€ãã玫ã§ãäžéšãåéç³ã«ãã£ãŠç·è²ã«å€è²ããŠãããããããã¯åéç³ã®åœè±¡äœãå®å šã«ä¿æããå «é¢äœãŸãã¯åäºé¢äœã®é éé±ã®åœ¢ç¶ãæã€ãã®ã§ããæãæãŸããæšæ¬ã¯ããããã®åœ¢ãšéé é é±ã®ãããªãã¯ã¹ãçµã¿åããããã®ã§ãäžè²ã®æšæ¬ãšãªããä»ã®æ¬§å·ã® locality ãšã¯ã»ãšãã©èŠåããã€ããªããã®ã§ãããã## ãã©ã³ã¹ã»ã·ã§ãŒããŒé±å±±ç£ãã¥ãŒãã©ã€ãã®ç¹æ§
Chessyç£ãã¥ãŒãã©ã€ãã¯ãçµæ¶åœ¢ããŸãè©äŸ¡ããããæšæºã®çµæ¶ã¯æ£å «é¢äœã§ããã°ãã°æ¹å€ããããšããžãæãã«åãããããšãããïŒåäºé¢äœåœ¢ãããæç®ã«èšé²ãããŠãããçµæ¶ã®é¢ã«ãããã¢ããç¶ãŸãã¯çªªã¿ãæã€æé·é¢ã¯ãæž æµã«ä¿ããããšç¹ã«é åçãªç¹åŸŽã§ãããå€ãã®çµæ¶ã¯ããããŒãããïŒæµ®éïŒåãã§ãåšå²ãå®å šã«ãŸãã¯ã»ãŒå®å šã§ããããããµã ãã€ã«æšæ¬ã§ã圫å»çãªååšæãäžããã
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ãµã€ãºã®æåŸ ã¯çŸå®çã§ãªããã°ãªããªããå€ãã®è¯å Chessy ãã¥ãŒãã©ã€ãã¯1 cm以äžã§ããã1â1.7 cmçšåºŠã®åŒ·åãªãµã ãã€ã«ã¯ãã§ã«é«ãã³ã¬ã¯ã·ã§ã³äŸ¡å€ãæã€ãèšé²äŸã«ã¯çŽ1 x 0.9 x 0.9 cm ã®çµæ¶ã1.5 cm ã®ã«ãŒã¹æ£å «é¢äœã1.7 cm ã®å€å žæšæ¬ãªã©ãæãããããã°ã«ãŒãã倧ããªåœåœ¢ãèŠãããChessy ã®åéç³-after-ãã¥ãŒãã©ã€ã圢ç¶ã3 cmãè¶ ãããšããåŒçšããããããããã¯äŸå€ã§ãããç¶æ ã圢ãç±æ¥ãæ éã«å€æãã¹ãã§ããã
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å質ã¯ã圢ç¶ãšçåã®åé¡ã§ãããéããšããžãæå·ã®ãªãçµç«¯ãåšå²ã®å®æåºŠãæç¢ºãªæ£å «é¢äœãŸãã¯åäºé¢äœã®åœ¢ãç·ã®åéç³ãšèµ€ããã¥ãŒãã©ã€ããéãåéç³é žäºéãšã®æž æœãªå¯Ÿæ¯ãäžè³ªãªç¹åŸŽã§ãããå·ã€ããè§ã®ãªãåç¬ã®èªç«ååœåœ¢ã¯ããã倧ãã圢ã®ãªãå¡ãããåªããŠããããšããããå€ãã©ãã«ã¯éåžžã«éèŠã§ãããæé«ã® Chessy ãã¥ãŒãã©ã€ãææã¯æŽå²çã§ãããæç®äžã® locality ã®æ··ä¹±ãçããããããã§ããã## Collector Notes
Authentic Chessy cuprite is usually small, old, and specific in habit. The safest acquisitions are specimens with a convincing old label, a recognized collection history, or publication-quality provenance from a reputable dealer. Loose green octahedra are attractive, but without matrix or documentation they require caution: the market has seen malachite-after-cuprite from other localities, and some Arizona pieces can superficially evoke the Chessy look. A blue azurite association helps, but it is not a substitute for provenance.
No well-documented pattern of fabricated Chessy cuprite fakes appears in the standard collector references consulted, and one current cuprite reference explicitly notes no known fakes for the species. That said, malachite as a material is widely imitated in decorative objects, and general malachite fakes, resin reconstructions, and glued composites do exist in the broader market. For Chessy specimens, the more realistic risks are misattribution, repaired crystals, glued-on or reattached floaters, enhanced display mounting, and optimistic âcupriteâ descriptions applied to complete malachite pseudomorphs where no red cuprite is actually visible.
Condition issues are common because the very features collectors prize are vulnerable. Octahedral corners nick easily; hoppered faces collect dirt and glue; azurite matrix can be friable; and old specimens may have been trimmed, cleaned, or mounted repeatedly over two centuries of collecting. Under magnification, look for bruised vertices, bright fresh breaks on dark red cuprite, glue at contact points, and mismatched matrix around a supposedly attached crystal. A pristine one-centimeter floater is not âtoo smallââfor Chessy, it may be exactly the size and format of the best material.
Rarity is real. The underground mines are closed and inaccessible, the principal specimen-producing zones were exhausted in the nineteenth century, and the dumps have been worked hard by generations of French collectors. Good cuprite and malachite-after-cuprite specimens appear episodically from old collections, estate dispersals, European dealers, and occasional auction lots. Public market records show strong interest even in thumbnails: a small complete malachite-after-cuprite floater sold for several hundred dollars in 2021, while finer old pseudomorphs with strong labels or multiple sharp crystals have reached the low thousands. The market rewards sharpness, old provenance, and the classic blue-green-red association far more than bulk.## Stories & Field Notes
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Louis Cordier, âMémoire sur les cristaux de cuivre carbonaté de Chessy,â Annales des Mines, 1819 â HaÃŒyã®èгå¯ã«åºã¥ãåæçµæ¶åŠã® MemoirãChessyã®éè²ç¢³é žéçµæ¶ã欧å·ã³ã¬ã¯ã·ã§ã³ã«äžãã圱é¿ãèšé²ã
M. Thibaud, âDescription des procédés suivis à Chessy pour la préparation mécanique des minerais,â Annales des Mines, 1827 â Chessyã«ãããé±ç³ã®æ©æ¢°å å·¥ã®æè¡å²çå ±åãéè²ç¢³é žé±ç³ãšé žåé ææãå«ãã
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Heritage Auctions, âMalachite pseudomorph after Cuprite, Chessy Copper Mines,â sold May 4, 2014 â ãããªãã¯ãªãŒã¯ã·ã§ã³èšé²ãããªèªç¶å²åç©é€šã®ã©ãã«ãä»ããçµåããããããŒãã»åéç³åŸã® cuprite ã®æšæ¬ã
Le Comptoir Géologique, âCuprite Encyclopediaâ â Chessy ã®äžççãªè©å€ã瀺ãç°¡æœãªçš®å¥åç §ãå «é¢äœããã³åäºé¢äœã®åéç³ã®åœåœ¢åŸç©ã«ã€ããŠã®èšè¿°ã## Videos & Media
Malachite after Cuprite with Azurite â Weinrich Minerals â 4.0 cmã®ãã§ãã·ãŒã»ãããã¥ã¢ã®1.2 cmã®ããããªãã¯çµæ¶ãã¢ãºã©ã€ãã§çœ®æãããé é±ã¯ãªã¹ã¿ã«ã®ãããªä»ããã£ãŒã©âæšæ¬ããŒãžã
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Azurite, Chessy-les-Mines, RhÃŽne â Les Minéraux â William Foulkes Loweã³ã¬ã¯ã·ã§ã³ã®ãã§ãã·ãŒã»ã¢ãºã©ã€ãæšæ¬ãåã蟌ãã çããããªãå«ããã£ãŒã©âã¢ãŒã«ã€ãããŒãžã