Startseite Jasonsmithite, a new phosphate mineral with a complex microporous framework, from the Foote mine, North Carolina, U.S.A
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Jasonsmithite, a new phosphate mineral with a complex microporous framework, from the Foote mine, North Carolina, U.S.A

  • Anthony R. Kampf ORCID logo , Aaron J. Celestian und Barbara P. Nash
Veröffentlicht/Copyright: 29. Januar 2021
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 106 Heft 2

Abstract

Jasonsmithite (IMA2019-121), M n 4 2 + ZnAl(PO4)4(OH)(H2O)7·3.5H2O, is a pegmatite-phosphate mineral from the Foote Lithium Company mine, Kings Mountain district, Cleveland County, North Carolina, U.S.A. It is interpreted as having formed by late-stage, low-temperature hydrothermal alteration. Crystals are colorless to light brown, slightly flattened prisms to about 1 mm in length with wedge-shaped terminations. The mineral is transparent with vitreous luster, white streak, Mohs hardness 2, brittle tenacity, irregular fracture, and perfect {001} cleavage. The density is 2.63(2) g/cm3. Jasonsmithite is biaxial (–), with α = 1.561(2), β = 1.580(2), γ = 1.581(2), measured in white light. The 2V is 25(5)° and dispersion is r < v moderate. The optical orientation is Y = b, X ^ c = 18° in obtuse β. The Raman spectrum is dominated by vibrational modes of PO4 and ZnO4 tetrahedra, AlO6 and MnO6 octahedra, and OH groups. Electron microprobe analyses gave the empirical formula (Mn3.09Fe0.87)Σ3.96Zn1.05Al0.98(PO4)4(OH)(H2O)7·3.5H2O. The mineral is monoclinic, P21/c, a = 8.5822(3), b = 13.1770(6), c = 20.3040(14) Å, β = 98.485(7)°, V = 2271.0(2) Å3, and Z = 4. The structure (R1 = 0.0443 for 3685 I>2σI reflections) contains zigzag chains of edge-sharing MnO6 octahedra that corner-link to adjacent chains and to PO4 tetrahedra to form sheets, which are decorated by ZnO4 tetrahedra. The sheets are linked to one another via dimers of AlO6 octahedra, forming a framework with large channels containing H2O groups. With H2O groups removed, the framework has a void space of 70.2% per unit cell, and a framework density of 14.5 polyhedral atoms/1000 Å3, which would place jasonsmithite among the most porous minerals.

Keywords: Jasonsmithite; new mineral; phosphate; microporous framework structure; Raman spectroscopy; Foote mine; Kings Mountain; North Carolina; U.S.A; Microporous Materials: Crystal-Chemistry; Properties; and Utilizations

† Special collection papers can be found online at http://www.minsocam.org/MSA/AmMin/special-collections.html

Acknowledgments

Reviewers Ian Grey and Fernando Colombo are thanked for their constructive comments on the manuscript. A portion of this study was funded by the John Jago Trelawney Endowment to the Mineral Sciences Department of the Natural History Museum of Los Angeles County.

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Received: 2020-05-01
Accepted: 2020-06-29
Published Online: 2021-01-29
Published in Print: 2021-02-23

© 2021 Walter de Gruyter GmbH, Berlin/Boston

Artikel in diesem Heft

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  2. Jasonsmithite, a new phosphate mineral with a complex microporous framework, from the Foote mine, North Carolina, U.S.A
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  7. On the crystal chemistry of sulfur-rich lazurite, ideally Na7Ca(Al6Si6O24)(SO4)(S3)–·nH2O
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  10. The composition of garnet in granite and pegmatite from the Gangdese orogen in southeastern Tibet: Constraints on pegmatite petrogenesis
  11. Formation of metasomatic tourmalinites in reduced schists during the Black Hills Orogeny, South Dakota
  12. New insights into the crystal chemistry of sauconite (Zn-smectite) from the Skorpion zinc deposit (Namibia) via a multi-methodological approach
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  14. Elucidating the natural–synthetic mismatch of Pb2+Te4+O3: The redefinition of fairbankite to P b 12 2 + T e 4 + O 3 11 S O 4
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  16. American Mineralogist thanks the 2020 reviewers
https://doi.org/10.2138/am-2020-7582
Schlagwörter für diesen Artikel
Jasonsmithite; new mineral; phosphate; microporous framework structure; Raman spectroscopy; Foote mine; Kings Mountain; North Carolina; U.S.A; Microporous Materials: Crystal-Chemistry; Properties; and Utilizations

Artikel in diesem Heft

  1. Effect of water on carbonate-silicate liquid immiscibility in the system KAlSi3O8- CaMgSi2O6-NaAlSi2O6-CaMg(CO3)2 at 6 GPa: Implications for diamond-forming melts
  2. Jasonsmithite, a new phosphate mineral with a complex microporous framework, from the Foote mine, North Carolina, U.S.A
  3. Titanium in calcium amphibole: Behavior and thermometry
  4. Phase relationships in the system ZnS-CuInS2: Insights from a nanoscale study of indium-bearing sphalerite
  5. Major and trace element composition of olivine from magnesian skarns and silicate marbles
  6. Decompression experiments for sulfur-bearing hydrous rhyolite magma: Redox evolution during magma decompression
  7. On the crystal chemistry of sulfur-rich lazurite, ideally Na7Ca(Al6Si6O24)(SO4)(S3)–·nH2O
  8. Experimental evaluation of a new H2O-independent thermometer based on olivine-melt Ni partitioning at crustal pressure
  9. Contrasting compositions between phenocrystic and xenocrystic olivines in the Cenozoic basalts from central Mongolia: Constraints on source lithology and regional uplift
  10. The composition of garnet in granite and pegmatite from the Gangdese orogen in southeastern Tibet: Constraints on pegmatite petrogenesis
  11. Formation of metasomatic tourmalinites in reduced schists during the Black Hills Orogeny, South Dakota
  12. New insights into the crystal chemistry of sauconite (Zn-smectite) from the Skorpion zinc deposit (Namibia) via a multi-methodological approach
  13. The new mineral crowningshieldite: A high-temperature NiS polymorph found in a type IIa diamond from the Letseng mine, Lesotho
  14. Elucidating the natural–synthetic mismatch of Pb2+Te4+O3: The redefinition of fairbankite to P b 12 2 + T e 4 + O 3 11 S O 4
  15. Are the thermodynamic properties of natural and synthetic Mg2SiO4-Fe2SiO4 olivines the same?
  16. American Mineralogist thanks the 2020 reviewers
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