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Mineralogical ClassificationIMA 2015-029 = kayrobertsonite
10th Sep 2016 12:17 UTCMarco E. Ciriotti Manager
▪ Mills, S.J., Grey, I.E., Kampf, A.R., Birch, W.D., MacRae, C.M., Smith, J.B., Keck, E. (2016): Kayrobertsonite, MnAl2(PO4)2(OH)2·6H2O, a new phosphate mineral related to nordgauite. European Journal of Mineralogy, 28, 649-654.
Abstract:
Kayrobertsonite, MnAl2(PO4)2(OH)2·6H2O, is a new secondary phosphate mineral from the Hagendorf South pegmatite, Hagendorf, Oberpfalz, Bavaria, Germany and the Foote Lithium Company mine, Kings Mountain district, Cleveland County, North Carolina, USA. Kayrobertsonite crystals occur as intergrown masses of snow-white, soft, finely fibrous needles, less than 5 μm in diameter and no more than 100 μm in length. Quantitative analysis of Foote mine kayrobertsonite gave the empirical formula: Mn0.98Ca0.03Fe0.02Al1.90P2.03O8(OH)1.88F0.03(H2O)0.09 · 6H2O; and for Hagendorf Süd kayrobertsonite: Mn0.92Ca0.06Fe0.02Al1.87(PO4)2 (OH)1.19F0.42(H2O)0.39 · 6H2O. Foote mine kayrobertsonite crystals are biaxial (–), with indices of refraction α = 1.530(1), β = 1.554(1), γ = 1.566(1), measured in white light; 2V(meas.) is 70.3(5)°, while 2V(calc.) is 69.6°. The mineral is nonpleochroic. The orientation of the crystals is Z ∼ c (length slow). Kayrobertsonite is triclinic, space group P-1, with the unit-cell parameters: a = 10.049(2), b = 10.205(2), c = 6.083(1)Å, α = 91.79(3), β = 99.70(3), γ = 98.02(3)°, V = 607.9(2)Å3 and Z = 2 (Foote mine). The polyhedral framework in kayrobertsonite has the same topology as that in nordgauite, but with replacement of F by OH at the bridging anion sites. The main crystal chemical change from nordgauite to kayrobertsonite is a doubling of the number of water molecules in the [001] channels.
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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: April 20, 2024 00:54:05