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🇮🇩💎 GIA Soroti Penemuan Native Copper dalam Chalcedony Indonesia! Indonesia kembali mendapat perhatian dunia gemologi! Dalam edisi Spring 2025 Micro-World, GIA mempublikasikan penelitian mengenai Native Copper yang ditemukan sebagai inklusi alami di dalam chalcedony dari Lawang Kidul, Garut, Jawa Barat. Berbeda dengan chalcedony dari daerah lain yang mengandung mineral tembaga sekunder, material dari Garut ini didominasi oleh tembaga murni alami (native copper) yang membentuk pola-pola unik ...
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