gem peg
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They are mica, lithium beryllium tantalum and gem bearing peg matite, marine volcanic massive sulfide, magmatic copper nickel, metasedimentary iron, gold bearing low grade metamorphosed carbon clastic rocks and gold bearing ductile shear zone. A great progress has been made in recent exploration of porphyry copper.
已知矿床的主要类型有伟晶岩型矿床、与海相火山岩有关的块状硫化物矿床、岩浆铜镍硫化物型矿床、沉积变质型铁矿、浅变质含碳细碎屑岩型金矿和韧性剪切带型金矿床，近年来在斑岩型铜矿床的找矿工作有了新进展。
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宝石切磨师(同lapidary)：gem cutter
gem cloth 用于洁净宝石的布 | gem cutter 宝石切磨师(同lapidary) | gem dealer 宝石销售商
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gem gravels：宝石砾层
gem grade diamond ==> 宝石级金刚石 | gem gravels ==> 宝石砾层 | gem mounting ==> 宝石镶嵌
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gem gravels：宝石砾:含宝石的古代或现代砂砾层
gem geologist 宝石地质学家 | gem gravels 宝石砾:含宝石的古代或现代砂砾层 | gem identification 宝石鉴定