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Orientation of exsolved pentlandite in natural and synthetic nickeliferous pyrrhotite

Carl A. Francis, Michael E. Fleet, Kamakhya Prakash Misra, James R. Craig

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Abstract

Pentlandite (pn), (Fe, Ni)rSB, exsolves from nickeliferous pyrrhotite (po), (Fe, Ni)r-,S, in the form of flames exhibiting weak reflection anisotropism and preferred orientation. X-ray precession studies on both natural and synthetic crystals have established the orientation relation: (111)pnll (00.1)po; (0Tl )pn ll (l 1.0)po; (TT2)pn ll (10.0)po. In synthesis experiments, rapidly quenched samples of (Fe,Ni)r-,S solid solutions contain randomly oriented blebs of pentlandite, whereas slowly cooled charges contain coherent lamellae of pentlandite parallel to (00.1) of pyrrhotite.

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Pentlandite (pn), (Fe, Ni)rSB, exsolves from nickeliferous pyrrhotite (po), (Fe, Ni)r-,S, in the form of flames exhibiting weak reflection anisotropism and preferred orientation. X-ray precession studies on both natural and synthetic crystals have established the orientation relation: (111)pnll (00.1)po; (0Tl )pn ll (l 1.0)po; (TT2)pn ll (10.0)po. In synthesis experiments, rapidly quenched samples of (Fe,Ni)r-,S solid solutions contain randomly oriented blebs of pentlandite, whereas slowly cooled charges contain coherent lamellae of pentlandite parallel to (00.1) of pyrrhotite.

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Available abstract

Pentlandite (pn), (Fe, Ni)rSB, exsolves from nickeliferous pyrrhotite (po), (Fe, Ni)r-,S, in the form of flames exhibiting weak reflection anisotropism and preferred orientation. X-ray precession studies on both natural and synthetic crystals have established the orientation relation: (111)pnll (00.1)po; (0Tl )pn ll (l 1.0)po; (TT2)pn ll (10.0)po. In synthesis experiments, rapidly quenched samples of (Fe,Ni)r-,S solid solutions contain randomly oriented blebs of pentlandite, whereas slowly cooled charges contain coherent lamellae of pentlandite parallel to (00.1) of pyrrhotite.

Key concepts: Pentlandite, Pyrrhotite, Geology, Materials science, Mineralogy, Orientation (vector space), Crystallography, Chemistry

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