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落葉風(fēng)塵金蟲 (知名作家)
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[求助]
求幫助,大神們幫忙翻譯下
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| For years Nigeria (table 2) was known for its intense blue aquamarine, a gem variety of beryl, considered by many to be the finest commercial quality available, even with the minor inclusions inherent in the material. As supplies ran short the Nigerian miners found a new source of tourmaline (elbaite) in brownish-red to red colors, some of which is considered to be rubellite. It is estimated that 100 tons of this tourmaline rough of all qualities came out during the last few years, mostly from alluvial sources close to its formation, as evidenced by the mostly sharp crystals and lack of erosion on many of the pieces. This material is now scarcely found in the rough. Instead, a blue-green to blue tourmaline, some of which is considered to be indicolite, is now being mined in a different locality. |
捐助貴賓 (著名寫手)
商家已經(jīng)主動聲明此回帖可能含有宣傳內(nèi)容| 多年來,尼日尼亞(表2)一直以其高亮藍光海藍寶石聞名世界,這種寶石材質(zhì)中,雖然有少許天然雜質(zhì),但其包含各種蒼綠玉,被認為具有最好的商品質(zhì)量。但由于供應(yīng)短缺,尼日利亞礦工又發(fā)現(xiàn)一種新的電氣石(鋰電氣石),色度由棕紅色到純紅色不一,其中有些還被認為是紅電氣石。據(jù)估計,在過去的幾年間,有約100噸的這種品質(zhì)不一的電氣石出土,它們是由沖積層(與其形成層接近)中最為鋒利的晶體,由于多面缺少自然腐蝕而形成。目前這種材料基本上很難被發(fā)現(xiàn),相反, 一些色度由藍綠到純綠的電氣石(其中有些是藍電氣石)在許多不同地方被挖掘到。 |
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