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中文名:金門基盤岩石
料羅、大安、溪邊、鵲山、田浦、青嶼、山后、寒舍花及南側成功、京城、古崗(圖2~圖6)。 基盤花崗片麻岩銣-鍶放射性同位素定年之結果列於表1與其附圖。銣-鍶同位素等時線年齡158.9±2.4 Ma,代表.....more
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中文名:六大晶系礦物界中的最大...
。例如:綠柱石、石英屬之。 4.斜方晶系(Orthorhombic system)-具有不等長的三晶軸,且彼此互相垂直。例如:硫磺、橄欖石屬之。 5.單斜晶系(Monoclinic.....more
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中文名:寶石的評鑑 4C
(Inclusion)產生,而它的內含物通常還是鑑定真偽的重要指標,如紅寶石中的絲狀(Silk)內含物,就是鑑定天然紅寶石的重要依據。 4.車工(Cut)-車工是寶石唯一經過人工處理的程序,然而優良的車工能讓.....more
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中文名:六大晶系礦物界中的最大...
方晶系(Hexagonal system)-具有四晶軸,其中三個水平晶軸等長,且彼此以60°角斜交;另一垂直晶軸與水平晶軸成直角相交,但不等長。例如:綠柱石、石英屬之。 4.斜方晶系.....more
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