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Mineralogical ClassificationIMA 2012-084 = peterandresenite
22nd Aug 2014 11:47 UTCMarco E. Ciriotti Manager
▪ Friis, H., Larsen, A.O., Kampf, A.R., Evans, R.J., Selbekk, R.S., Aranda Sanchez, A., Kihle, J. (2014): Peterandresenite, Mn4Nb6O19·14H2O, a new mineral containing the Lindqvist ion from a syenite pegmatite of the Larvik Plutonic Complex, southern Norway. European Journal of Mineralogy, 26, 567-576.
Abstract:
Peterandresenite (IMA2012-084), ideally Mn4Nb6O19·14H2O, is the first naturally occurring hexaniobate. It was found at the AS Granit larvikite quarry in Tvedalen, Larvik, Vestfold, Norway, by private collector Peter Andresen, after whom the mineral is named. The mineral was found on fracture surfaces and in tiny vugs in the centre of a miaskitic pegmatite dike. It occurs as equidimensional, transparent to translucent orange crystals up to 1 mm with a pale orange streak and a vitreous to resinous lustre. The Mohs hardness is 2–2.5 and the mineral is brittle with uneven fracture and no cleavage. D(calc.) = 3.05 g/cm3 and D(meas.) = 3.10(1) g/cm3. Peterandresenite is biaxial (-) and the refractive indices (white light) are: α = 1.760(5), β = 1.795(5) and γ = 1.800(5); 2V (meas.) = 43(2)° and 2V (calc.) = 40.&7ring;. The mineral exhibits strong dispersion (r > v) and is pleochroic with X (colourless) < Z (pale orange)< are: 9.8977 (82) (001), 7.7104 (42) (110), 7.4689 (39) (20–1), 7.1026 (63) (11–1) and 2.9260 (100) (42–2). The mineral is monoclinic, C2/m, with a = 15.329(1), b = 9.4121(5), c = 11.2832(9) Å, β = 118.650(4)°;, V = 1428.6(2) Å3 and Z = 2. Peterandresenite has a novel structure consisting of six edge-sharing Nb-octahedra forming a super octahedron known as a Lindqvist ion. One Mn2+ octahedron interconnects three Lindqvist ions to form a two dimensional layer perpendicular to the c-axis. A second Mn2+ octahedron bridging with the Lindqvist ion protrudes into the adjacent layer along the c-axis and creates a three dimensional structure via hydrogen bonds.
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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 26, 2024 03:31:46