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Peterandresenite, Mn (sub 4) Nb (sub 6) O (sub 19) .14H (sub 2) O, a new mineral containing the Lindqvist ion from a syenite pegmatite of the Larvik plutonic complex, Southern Norway

Henrik Friis, Alf Olav Larsen, Anthony R. Kampf, R. James Evans, Rune S. Selbekk, Aranda Sanchez and Jan Kihle
Peterandresenite, Mn (sub 4) Nb (sub 6) O (sub 19) .14H (sub 2) O, a new mineral containing the Lindqvist ion from a syenite pegmatite of the Larvik plutonic complex, Southern Norway
European Journal of Mineralogy (August 2014) 26 (4): 567-576

Abstract

Peterandresenite (IMA2012-084), ideally Mn (sub 4) Nb (sub 6) O (sub 19) .14H (sub 2) O, 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 (sub (calc.)) = 3.05 g/cm (super 3) and D (sub (meas.)) = 3.10(1) g/cm (super 3) . Peterandresenite is biaxial (-) and the refractive indices (white light) are: alpha = 1.760(5), beta = 1.795(5) and gamma = 1.800(5); 2V (meas.) = 43(2) degrees and 2V (calc.) = 40.7 degrees . The mineral exhibits strong dispersion (r > v) and is pleochroic with X (colourless) < Z (pale orange) << Y(medium orange). The optical orientation is: X nearly equal c,y nearly equal a*,Z = b. The empirical formula based on electron microprobe analyses is (Mn (sub 3.92) Ca (sub 0.05) Na (sub 0.03) ) (sub Sigma 4.00) (Nb (sub 5.71) Mn (sub 0) . (sub 13) Fe (sub 0) . (sub 1 2) Si (sub 0.03) ) (sub Sigma 5.99) O (sub 18.57) .14H (sub 2) O. The five strongest reflections in the X-ray diffraction pattern [d (sub obs.) in Aa (I) (hkl)] 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) Aa, beta = 118.650(4) degrees , V = 1428.6(2) Aa (super 3) 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 Mn (super 2) (super +) octahedron interconnects three Lindqvist ions to form a two-dimensional layer perpendicular to the c-axis. A second Mn (super 2+) octahedron bridging with the Lindqvist ion protrudes into the adjacent layer along the c-axis and creates a three-dimensional structure via hydrogen bonds.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 26
Serial Issue: 4
Title: Peterandresenite, Mn (sub 4) Nb (sub 6) O (sub 19) .14H (sub 2) O, a new mineral containing the Lindqvist ion from a syenite pegmatite of the Larvik plutonic complex, Southern Norway
Affiliation: University of Oslo, Natural History Museum, Oslo, Norway
Pages: 567-576
Published: 201408
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 40
Accession Number: 2014-082896
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
N59°02'21" - N59°02'21", E09°51'25" - E09°51'25"
Secondary Affiliation: Natural History Museum of Los Angeles County, USA, United StatesUniversity of British Columbia, CAN, CanadaInstitute for Energy Technology, NOR, Norway
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201443
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