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Canada | |
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| David Joyce |
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Norway | |
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| Barth, T. (1927): Die Pegmatitgänge der kaledonischen intrusivgesteine in Seiland-gebiete. Det Norske Videnskaps-Akademi Skrifter. 1. Mat.-Naturv. Klasse 1927. No.8. 123p |
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USA | |
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| Marian Lupulescu (2009) The 36th Rochester Mineralogical Symposium, April 23-26, programme abstracts, 21-23. |
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| Barbara A.Olsen,Harry Y.McSween Jr.(1983) Petrogensis of the Concord Gabbro-Syenite Complex,North Carolina:American Mineralogist,Vol.68.pg. 315-333,1983,pg #325 |
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| Susina,Dana L.(2010) Characterization of a Ultra High Purity Quartz Deposit,Spruce Pine Mining District,North Carolina,Paper No.132-6 |
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| J.D. Price et al. , Eur. J. Mineral. , 1996, 8, pp. 435-451. |