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Mineralogical ClassificationIMA 2013-072 = ferro-ferri-nybøite
21st Jul 2015 09:28 UTCMarco E. Ciriotti Manager
▪ Lussier, A.J., Hawthorne, F.C., Abdu, Y.A., Ball, N.A., Tait, K.T., Back, M.E., Steede, A.H., Taylor, R., McDonald, A.M. (2014): Ferro-ferri-nybøite, NaNa2(Fe2+3Fe3+2)Si8O22(OH)2, a new clinoamphibole from Mont Saint-Hilaire, Québec, Canada: Description and crystal structure. [i]Canadian Mineralogist[/i], [b]52[/b], 1019-1026.
Abstract:
Ferro-ferri-nybøite, NaNa2(Fe2+3Fe3+2)Si8O22(OH)2, is a new mineral of the amphibole group from Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie (formerly Rouville County), Québec, Canada. It occurs in an igneous microbreccia associated with a eudialyte-group mineral, an astrophyllite-group mineral, albite, and nepheline. Crystals are prismatic parallel to [001] with {100} and {110} forms and cleavage surfaces, and the prism direction is terminated by irregular fractures. Grains are up to 3 cm long, and occur as blocky aggregates. Crystals are black with a greyish-green to black streak. Ferro-ferri-nybøite is brittle, has a Mohs hardness of 6 and a splintery fracture; it is non-fluorescent with perfect {110} cleavage, no observable parting, and has a calculated density of 3.424 g/cm3. Crystals show extreme optical absorption due to intervalence charge transfer, which inhibited measurement of optical properties.
Ferro-ferri-nybøite is monoclinic, space group[i] C[/i]2/[i]m[/i], [i]a[/i] 9.9190(5), [i]b[/i] 18.0885(8), [i]c[/i] 5.3440(3) Å, β 103.813(1)°, [i]V[/i] 931.09(13) Å3, [i]Z[/i] = 2. The strongest ten X-ray diffraction lines in the powder pattern are [d in Å(I)(hkl)]: 8.520(100)(110), 3.162(55)(310), 2.834(24)(330), 1.671(19)(461), 2.732(10)(151), 2.552(10)(Formula02), 2.344(9)(Formula51), 3.298(7)(240), 2.606(6)(061), 1.446(6)(Formula61,4.10.0). Analysis by a combination of electron microprobe and Mössbauer spectroscopy gives SiO2 45.80, Al2O3 3.11, TiO2 0.50, Fe2O3 11.18, FeO 23.45, MnO 2.28, ZnO 0.12, MgO 0.23, CaO 0.99, Na2O 8.01, K2O 1.30, F 0.81, H2Ocalc 1.47, O ≡ F−0.34 sum 98.91 wt.%. The formula unit, calculated on the basis of 24 (O + OH + F) with (OH + F) = 2 apfu is (Na0.68K0.27)Σ0.95(Na1.83Ca0.17)Σ2.00(Mg0.06Fe2+3.17Mn0.31Zn0.01Fe3+1.36Ti0.06)Σ4.97(Si7.41Al0.59)Σ8.00O22(OH1.58F0.42)Σ2.00. Ferro-ferri-nybøite, ideally NaNa2(Fe2+3Fe3+2)Si8O22(OH)2, is related to endmember nybøite, NaNa2(Mg3Al2)Si8O22(OH)2 by the substitutions Fe2+ → Mg and Fe3+ → Al.
21st Jul 2015 11:42 UTCKnut Edvard Larsen 🌟 Manager
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: May 8, 2024 09:13:40