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Search for specimens: View all adamite specimens from Tsumeb Mine, Namibia
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Tsumeb adamite occurs in several habits, and the habit is often a clue to its paragenesis. The most admired true adamite specimens show blocky, lustrous, translucent yellow to yellow-green crystals, commonly perched on white smithsonite. Reported end-member adamite crystals reach 37 mm, while well-documented museum material includes yellow-green blocky crystals to 25 mm and tabular yellow crystals to 9 mm on sheaf-like white smithsonite over yellow tsumcorite.
Color is the most treacherous and most useful feature. Colorless, white, pale yellow, golden yellow, yellow-brown, brownish-green, and pinkish material can all be true adamite at Tsumeb. Pink to plum coloration in rare cobalt-bearing adamite can be caused by very small cobalt contents, with one studied example showing near end-member adamite containing less than 2 mol percent copper and about 540 ppm cobalt. By contrast, much bright green material historically called âcuprian adamiteâ falls in the compositional range of zincolivenite, not adamite sensu stricto.
Crystal forms vary from blocky and tabular to prismatic and, in rare cases, needle-like. The unusual 35 Level/North East Stope material includes pale-green adamite in tabular, petalloid crystals forming three-dimensional mounds, with adamite mixed with anglesite, feinglosite, and mimetite over massive sulphide. The 44 Level Zinc Pocket produced the opposite style: fine white needles with leiteite and legrandite. Older âcuproadamiteâ labels may describe rhombic, pseudo-octahedral, prismatic, or chisel-terminated crystals, but many of those are now better considered zincolivenite unless analyzed.
Associated minerals are one of the pleasures of Tsumeb adamite. Confirmed associations include smithsonite, tsumcorite, anglesite, feinglosite, mimetite, calcite, cerussite, chalcocite, conichalcite, duftite, goethite, hemimorphite, leiteite, legrandite, olivenite, paradamite, quartz, reinerite, tennantite-(Zn), wilhelmkleinite, willemite, and zincolivenite. More exotic Tsumeb arsenates and related species can occur in the same chemical neighborhoods, so a matrix sprinkled with minor grains should be examined carefully rather than dismissed as âjust matrix.â
Typical collector pieces range from thumbnails and miniatures with a few crystals to small cabinet and cabinet specimens with a full display face. Fine adamite from Tsumeb is not usually a large-mass species; quality is measured in crystal sharpness, damage-free terminations, luster, translucency, contrast, and the confidence of the identification. A 25 mm single adamite crystal is already important. A 37 mm crystal on smithsonite is exceptional. Dense green druses can be attractive, but without analysis they may be better marketed as zincolivenite or adamite-zincolivenite series material rather than true adamite.æé«ã®ãã ãšãç£ã¢ããã€ãã«ã¯ã3çš®é¡ã®åæ§ã®ãããããåãã£ãŠããŸãã第äžã¯é»è²ã§å»ºç¯çãªç¹åŸŽãæã¡ãçœãã¹ããœãã€ããæ·¡ãçé žå¡©ã®äžã«ãçœãæž æœã«ç«ã€ãããã¯ç¶ããåéæãžãšå€åãã crystals ã䞊ã³ãŸãã第äºã¯ååŠçã»æŽå²çãªç¹åŸŽã§ãè¶è€è²ããã£ãç·è²ã®è¡šé¢ãæã€ç¬¬äžåž¯ã®ã³ãã«ã嫿ã¢ããã€ãã§ãå éšã«ã¯é ããæ¢ è²ã®èŠçŽ ããããŸãã第äžã¯å ±çæçãªæ§è³ªã§ãæ§ããã«èŠãããã®ã§ããã35éå±€ãŸãã¯44éå±€ç±æ¥ã®åæäžéåžžã«è峿·±ãç©è³ªã§ããã ãšãç¬ç¹ã®é 管æ§é ãæã€é±åºããããæ¥ãªãçšå°ãªç é žå¡©é¡ãäºéé±ç©ã®éã«ã¢ããã€ãã䜵åããŸãã## ã³ã¬ã¯ã¿ãŒããŒã
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Southwood, Malcolm; Å tevko, Martin; and Carr, Paul F. (2020). âTsumeb: Zincolivenite and the AdamiteâOlivenite Series.â Rocks & Minerals, 95, 210â232. DOI link
Pinch, William W. and Wilson, Wendell E. (1977). âMinerals [of Tsumeb]: A Descriptive List.â The Mineralogical Record, 8(3), 17â37. ãã¡ãé±å±±ããŒã峿žé€š
Strunz, Hugo (1959). âTsumeb, seine Erze und SekundÀrmineralien, insbesondere der neu aufgeschlossenen zweiten Oxydationszone.â Fortschritte der Mineralogie, 37, 87â90. ãã¡ãé±å±±ããŒã峿žé€š
Gebhard, Georg (1999). Tsumeb Vol. 2: A Unique Mineral Locality. GG Publishing. Mindat Tsumeb æç®ãªã¹ãã«æ²èŒ
Bowell, R. J. (2014). âHydrogeochemistry of the Tsumeb Deposit: Implications for Arsenate Mineral Stability.â Reviews in Mineralogy and Geochemistry, 79, 589â627. ãã¡ãé±å±±ããŒã峿žé€š
Bowell, R. J. and Mocke, H. (2018). âMinerals New to Tsumeb.â Communications of the Geological Survey of Namibia, 19, 20â46. PDF## Videos & Media
âTsumeb: Zincolivenite and the AdamiteâOlivenite Seriesâ â Malcolm Southwood; recorded by Bryan Svoboda at the 2019 Tsumeb Forum in Tucson â Adamiteâzincoliveniteâolivenite naming problem ãšãã® Tsumeb ã®æšæ¬ãžã®åœ±é¿ã説æããèªãä»ãã¹ã©ã€ããã¬ãŒã³ããŒã·ã§ã³ã URL: https://www.youtube.com/watch?v=3qgo9po-bT8
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