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Natropalermoite, Na2SrAl4(PO4)4(OH)4, a new mineral isostructural with palermoite, from the Palermo No. 1 mine, Groton, New Hampshire, USA

Published online by Cambridge University Press:  02 January 2018

Benjamin N. Schumer ,
Hexiong Yang  and
Robert T. Downs
Benjamin N. Schumer*
Affiliation:
Department of Geosciences, University of Arizona, 1040 E 4th Street, Tucson, AZ 85721-0077, USA
Hexiong Yang
Affiliation:
Department of Geosciences, University of Arizona, 1040 E 4th Street, Tucson, AZ 85721-0077, USA
Robert T. Downs
Affiliation:
Department of Geosciences, University of Arizona, 1040 E 4th Street, Tucson, AZ 85721-0077, USA
*
*E-mail: [email protected]
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Abstract

Natropalermoite, ideally Na2SrAl4(PO4)4(OH)4, the Na-analogue of palermoite, is a new mineral from the Palermo No. 1 mine, Groton, New Hampshire, USA. Associated minerals are palermoite, eosphorite and quartz. Natropalermoite crystal sare prismatic with striations parallel to the direction of elongation (the a axis) up to 200 μm × 50 μm × 45 μm in size. The mineral is colourless, transparent with a white streak and vitreous lustre and is visually indistinguishable from palermoite. It is brittle with subconchoidal fracture and has a Mohs hardness of 5.5. Cleavage is perfect on {001}, fair on {100} and no parting was observed. The calculated density is 3.502 g cm–3. Natropalermoite is biaxial (–), α = 1.624(1), β = 1.641(1), γ = 1.643(1) (589nm), 2Vmeas = 43(4)°, 2Vcalc = 38°. An electron microprobe analysis yielded an empirical formula (based on 20 O apfu) of (Na1.69Li0.31)∑2.00(Sr0.95Mg0.04Ca0.02Ba0.01)∑1.02(Al3.82Mn0.03Fe0.03)∑3.88(P1.01O4)4(OH)4.

Natropalermoite is orthorhombic, space group Imcb, a = 11.4849(6), b = 16.2490(7), c = 7.2927(4) Å, V = 1360.95(17) Å3, Z = 4. Natropalermoite is isotypic with palermoite, but substitution of the larger Na for Li results in substantial increase of the b cell parameter. Four of the seven Na–O distances are longer than their equivalents in palermoite, resulting in a more regular 7-fold coordination polyhedron about Na. The eight strongest peaks in the calculated X-ray powder diffraction are [dcalc(Å),Irel%, (hkl)]: [3.128, 100, (321)], [4.907, 68, (121)], [3.327, 48, (022)], [4.689, 45, (220)], [3.078, 45, (202)], [2.453, 38, (242)], [2.636, 35, (411)], [2.174, 35, (422)].

Keywords

natropalermoitenew mineralphosphatePalermo No. 1 minepegmatite
Type
Research Article
Information
Mineralogical Magazine , Volume 81 , Issue 4 , August 2017 , pp. 833 - 840
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

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References

Cameron, E.N., Larrabee, D.M., McNair, A.H., Page, J.J., Stewart, G.W. and Shainin, V.E. (1954) Pegmatite investigations, 1942-45, New England. United States Geological Survey Professional Paper, 225. Google Scholar
Downs, R.T., Bartelmehs, K.L., Gibbs, G.V and Boisen, M.B., Jr. (1993) Interactive software for calculating and displaying X-ray or neutron powder diffractometer patterns of crystalline materials. American Mineralogist, 78, 1104–1107.Google Scholar
Kampf, A.R., Falster, A.U., Simmons, W.B., Whitmore, R.B. (2013) Nizamoffite, Mn2+Zn2(PO4)2(H2O)4, the Mn analogue of hopeite from the Palermo No.1 pegmatite, North Groton, New Hampshire. American Mineralogist, 98, 1893–1898.CrossRefGoogle Scholar
Moore, P.B. and Araki, T. (1975) Palermoite, SrLi2[Al4(OH)4(PO4)4]: its atomic arrangement and relationship to carminite, Pb2[Fe4(OH)4(AsO4)4]. American Mineralogist, 60, 460–165.Google Scholar
Page, J.J. and Larrabee, D.M. (1962) Beryl resources of New Hampshire.United States Geological Survey Professional Paper, 353.Google Scholar
Segeler, C.G., Ulrich, W., Kampf, A.R. and Whitmore, R. W. (1981) Phosphate minerals of the Palermo No. 1 pegmatite. Rocks and Minerals, 56, 197–214.CrossRefGoogle Scholar
Sheldrick, G.M. (2008) A short history o. SHELX. Acta Crystallographica, A64, 112–122.Google Scholar