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Ammoniotinsleyite, (NH4)Al2(PO4)2(OH)⋅2H2O, a new mineral species from the guano deposit at Pabellón de Pica, Iquique Province, Chile

Published online by Cambridge University Press:  05 June 2020

Nikita V. Chukanov ,
Gerhard Möhn ,
Igor V. Pekov ,
Natalia V. Zubkova ,
Dmitry A. Ksenofontov ,
Dmitry I. Belakovskiy ,
Svetlana A. Vozchikova ,
Sergey N. Britvin  and
Joy Desor
Nikita V. Chukanov*
Affiliation:
Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432Russia Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991Russia
Gerhard Möhn
Affiliation:
Dr.-J.-Wittemannstrasse 5, 65527Niedernhausen, Germany
Igor V. Pekov
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991Russia
Natalia V. Zubkova
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991Russia
Dmitry A. Ksenofontov
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991Russia
Dmitry I. Belakovskiy
Affiliation:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt 8-2, Moscow, 119071Russia
Svetlana A. Vozchikova
Affiliation:
Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432Russia
Sergey N. Britvin
Affiliation:
Department of Crystallography, St Petersburg State University, Universitetskaya Nab. 7/9, 199034St Petersburg, Russia
Joy Desor
Affiliation:
Im Langenfeld 4, 61350Bad Homburg, Germany
*
*Author for correspondence: Nikita V. Chukanov, Email: chukanov@icp.ac.ru
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Abstract

The new leucophosphite-group mineral ammoniotinsleyite is found in a guano deposit located on the Pabellón de Pica Mountain, Iquique Province, Tarapacá Region, Chile. Associated minerals are halite, gypsum, salammoniac and clay minerals. Ammoniotinsleyite occurs as pink to pale violet globular aggregates up to 3 mm across with individual single crystals ~10–15 μm. The mineral is brittle. Its Mohs hardness is 4. Dmeas. = 2.42(2) g cm–3 and Dcalc. = 2.451 g cm–3. The IR spectrum shows the presence of NH4+ and PO43– groups and H2O molecules. Ammoniotinsleyite is optically biaxial (+), α = 1.557(2), β = 1.559 (calc.), γ = 1.563(2) (λ = 589 nm); and 2Vmeas. = 75(10)°. The chemical composition (K, Mg, Ca, Al, Fe and P from electron-microprobe data; H, C and N measured by gas chromatography on products of ignition at 1200°C; wt.%) is: (NH4)2O 7.25, K2O 1.50, MgO 0.42, CaO 0.34, Al2O3 29.91, Fe2O3 2.36, P2O5 43.97, H2O 14.89, CO2 below detection limit, total 100.64. The empirical formula is [(NH4)0.88K0.10Ca0.02)]Σ1.00(Al1.86Fe3+0.09Mg0.03)Σ1.98(PO4)1.96(OH)1.05⋅2.11H2O. The idealised formula is (NH4)2Al2(PO4)2(OH)⋅2H2O. The crystal structure of ammoniotinsleyite was refined based on powder X-ray diffraction data, using the Rietveld method. The final agreement factors are: Rp = 0.0071, Rwp = 0.0093 and Robs = 0.0167. The new mineral is isostructural with tinsleyite, spheniscidite and leucophosphite. It is monoclinic, space group P21/n, a = 9.5871(1) Å, b = 9.6089(1) Å, c = 9.6467(2) Å, β = 103.4461(8)°, V = 864.31(2) Å3 and Z = 4. The strongest reflections of the powder X-ray diffraction pattern [d,Å(I,%)(hkl)] are: 7.56(23)($\bar{1}$01), 6.71(79)(011, 110), 5.947(100)(101, $\bar{1}$11), 4.676(36)(002, 200), 3.032(28)($\bar{1}$13, 031, 130), 2.958(25)($\bar{2}$22, 310, $\bar{1}$31) and 2.635(29)($\bar{2}$31).

Keywords

ammoniotinsleyitenew mineralleucophosphite groupphosphatecrystal structureguanoPabellón de PicaChile
Type
Article
Information
Mineralogical Magazine , Volume 84 , Issue 5 , October 2020 , pp. 705 - 711
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2020

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Footnotes

Associate Editor: Ian T. Graham

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