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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. |
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