Polymorphism in sapphirine |
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| Authors: | Stefano Merlino |
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| Institution: | (1) Institute of Mineralogy and Petrography, University of Pisa, Italy |
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| Abstract: | Sapphirine-1Tc, a polymorph of sapphirine, was found in granulites near Wilson Lake, Labrador. It is triclinic with unit cell data: a=10.04, b=10.38, c=8.65 Å,  =107°33 ,  =95°07,  =123°55. The X-ray diffraction patterns of several crystals of sapphirine from Wilson Lake were investigated and evidence was found of solid state reactions that lead from the ordered polymorph-1Tc to a disordered arrangement of domains with the structure of sapphirine-2M, that is  normal sapphirine. |
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