NISNITE, Ni3Sn, A NEW NICKEL MINERAL SPECIES FROM THE JEFFREY MINE, ASBESTOS, QUEBEC

作者：Rowe Ralph^*; Grice Joel D; Poirier Glenn; Stanley Chris J; Horvath Laszlo

来源：The Canadian Mineralogist, 2011, 49(2): 651-656.

DOI：10.3749/canmin.49.2.651

• new mineral species
• Ni3Sn
• nisnite
• rodingite
• ophiolite
• polymorph
• synthetic compound
• Jeffrey mine
• Asbestos
• Quebec

Nisnite, ideally Ni3Sn, was found during a re-examination of heazlewoodite crystals in rodingite samples from the Jeffrey mine, Asbestos, Quebec. It occurs as bronze-colored metallic, striated, blocky and square to rectangular tabular crystals of up to 100 mm in length, with groupings of <= 1 mm growing on heazlewoodite. Crystal groupings exhibit a boxwork-like habit. Reflectance measurements in air gave 43.2 (470 nm), 49.1 (546 nm), 53.2 (589 nm), and 59.0% (650 nm). Minerals closely associated with nisnite are chromite, diopside, grossular, heazlewoodite and shandite. The mineral is cubic, P4/m (3) over bar2/m, with unit-cell parameter refined using powder-diffraction data: a 3.7349(6) angstrom, V 52.10(3) angstrom(3), Z = 1, D-calc = 9.41 g/cm(3). The average results of five and three electron-microprobe analyses on separate crystals gave Ni 57.88, Sn 40.17, sum 98.05 wt.% and Ni 59.24, Sn 41.00, sum 100.24 wt.%, corresponding to Ni2.98Sn1.02 on the basis of 4 apfu. The structure has been refined to an R index of 0.008% on the basis of 30 unique reflections. The structure of nisnite contains 12-coordinated Sn atoms (12 Ni) and 12-coordinated Ni atoms (8 Ni and 4 Sn). Among the three synthetic Ni3Sn phases known, nisnite corresponds to the ccp structure that has been synthesized at high pressure and high temperature.

• 出版日期2011-4