Jakobssonite, CaAlF5, a new mineral from fumaroles at the Eldfell and Hekla volcanoes, Iceland

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Jakobssonite, CaAlF5, a new mineral from fumaroles at the Eldfell and Hekla volcanoes, Iceland. / Balic Zunic, Tonci; Garavelli, A.; Mitolo, D.; Acquafredda, P.; Leonardsen, E.

I: Mineralogical Magazine, Bind 76, Nr. 3, 2012, s. 751–760.

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt

Harvard

Balic Zunic, T, Garavelli, A, Mitolo, D, Acquafredda, P & Leonardsen, E 2012, 'Jakobssonite, CaAlF5, a new mineral from fumaroles at the Eldfell and Hekla volcanoes, Iceland', Mineralogical Magazine, bind 76, nr. 3, s. 751–760. https://doi.org/10.1180/minmag.2012.076.3.22

APA

Balic Zunic, T., Garavelli, A., Mitolo, D., Acquafredda, P., & Leonardsen, E. (2012). Jakobssonite, CaAlF5, a new mineral from fumaroles at the Eldfell and Hekla volcanoes, Iceland. Mineralogical Magazine, 76(3), 751–760. https://doi.org/10.1180/minmag.2012.076.3.22

Vancouver

Balic Zunic T, Garavelli A, Mitolo D, Acquafredda P, Leonardsen E. Jakobssonite, CaAlF5, a new mineral from fumaroles at the Eldfell and Hekla volcanoes, Iceland. Mineralogical Magazine. 2012;76(3):751–760. https://doi.org/10.1180/minmag.2012.076.3.22

Author

Balic Zunic, Tonci ; Garavelli, A. ; Mitolo, D. ; Acquafredda, P. ; Leonardsen, E. / Jakobssonite, CaAlF5, a new mineral from fumaroles at the Eldfell and Hekla volcanoes, Iceland. I: Mineralogical Magazine. 2012 ; Bind 76, Nr. 3. s. 751–760.

Bibtex

@article{9e05f04f6eee4ca4b95f63d91b19a600,
title = "Jakobssonite, CaAlF5, a new mineral from fumaroles at the Eldfell and Hekla volcanoes, Iceland",
abstract = "The new mineral jakobssonite, ideally CaAlF5, was first found in crusts collected in 1988 from a fumarole on the Eldfell volcano, Heimaey Island, Iceland. It was subsequently found in similar crusts collected in 1991 from a fumarole on the Hekla volcano, Iceland. It is associated with leonardsenite (IMA2011-059), ralstonite, heklaite, anhydrite, gypsum, jarosite, hematite, opal and several fluoride minerals that have not been fully characterized. Jakobssonite occurs as soft white fragile crusts of acicular crystals <50 mm long. Its calculated density is 2.89 g cm3. Chemical analyses by energy dispersive spectrometry on a scanning electron microscope produced a mean elemental composition as follows: Ca, 18.99; Al, 18.55; Mg, 1.33; Na, 0.33; F, 50.20; O, 10.39; total 99.79 wt.%. The empirical chemical formula, calculated on the basis of 7 atoms per formula unit with all of the oxygen as OH, is (Ca0.73Mg0.09Na0.02)S0.84Al1.06F4.09(OH)1.01. Jakobssonite is monoclinic, space group C2/c, with a = 8.601(1), b = 6.2903(6), c = 7.2190(7) {\AA} , b = 114.61(1)o, V = 355.09(8) {\AA}3 and Z = 4. The crystal structure contains chains of [AlF6] octahedra which run parallel to the c axis. These chains are interconnected by chains of [CaF7] pentagonal bipyramids. Jakobssonite is isostructural with several other CaMIIIF5 compounds. The eight strongest lines in the powder diffraction diagram [d in {\AA} (I) (hkl)] are as follows: 4.91 (18) (110), 3.92 (76) (200), 3.15 (68) (020), 3.13 (100) (1-1-2 ), 2.27 (22) (2-2-2 ), 1.957 (21) (400), 1.814 (20) (1-3-2), 1.805 (22) (20-4 ). The chemical and crystal-structure analyses of jakobssonite are similar to synthetic CaAlF5 with minor substitutions of light elements (e.g. Na) or vacancies for Ca, and OH for F.",
author = "{Balic Zunic}, Tonci and A. Garavelli and D. Mitolo and P. Acquafredda and E. Leonardsen",
year = "2012",
doi = "10.1180/minmag.2012.076.3.22",
language = "English",
volume = "76",
pages = "751–760",
journal = "Mineralogical Magazine",
issn = "0026-461X",
publisher = "Mineralogical Society",
number = "3",

}

RIS

TY - JOUR

T1 - Jakobssonite, CaAlF5, a new mineral from fumaroles at the Eldfell and Hekla volcanoes, Iceland

AU - Balic Zunic, Tonci

AU - Garavelli, A.

AU - Mitolo, D.

AU - Acquafredda, P.

AU - Leonardsen, E.

PY - 2012

Y1 - 2012

N2 - The new mineral jakobssonite, ideally CaAlF5, was first found in crusts collected in 1988 from a fumarole on the Eldfell volcano, Heimaey Island, Iceland. It was subsequently found in similar crusts collected in 1991 from a fumarole on the Hekla volcano, Iceland. It is associated with leonardsenite (IMA2011-059), ralstonite, heklaite, anhydrite, gypsum, jarosite, hematite, opal and several fluoride minerals that have not been fully characterized. Jakobssonite occurs as soft white fragile crusts of acicular crystals <50 mm long. Its calculated density is 2.89 g cm3. Chemical analyses by energy dispersive spectrometry on a scanning electron microscope produced a mean elemental composition as follows: Ca, 18.99; Al, 18.55; Mg, 1.33; Na, 0.33; F, 50.20; O, 10.39; total 99.79 wt.%. The empirical chemical formula, calculated on the basis of 7 atoms per formula unit with all of the oxygen as OH, is (Ca0.73Mg0.09Na0.02)S0.84Al1.06F4.09(OH)1.01. Jakobssonite is monoclinic, space group C2/c, with a = 8.601(1), b = 6.2903(6), c = 7.2190(7) Å , b = 114.61(1)o, V = 355.09(8) Å3 and Z = 4. The crystal structure contains chains of [AlF6] octahedra which run parallel to the c axis. These chains are interconnected by chains of [CaF7] pentagonal bipyramids. Jakobssonite is isostructural with several other CaMIIIF5 compounds. The eight strongest lines in the powder diffraction diagram [d in Å (I) (hkl)] are as follows: 4.91 (18) (110), 3.92 (76) (200), 3.15 (68) (020), 3.13 (100) (1-1-2 ), 2.27 (22) (2-2-2 ), 1.957 (21) (400), 1.814 (20) (1-3-2), 1.805 (22) (20-4 ). The chemical and crystal-structure analyses of jakobssonite are similar to synthetic CaAlF5 with minor substitutions of light elements (e.g. Na) or vacancies for Ca, and OH for F.

AB - The new mineral jakobssonite, ideally CaAlF5, was first found in crusts collected in 1988 from a fumarole on the Eldfell volcano, Heimaey Island, Iceland. It was subsequently found in similar crusts collected in 1991 from a fumarole on the Hekla volcano, Iceland. It is associated with leonardsenite (IMA2011-059), ralstonite, heklaite, anhydrite, gypsum, jarosite, hematite, opal and several fluoride minerals that have not been fully characterized. Jakobssonite occurs as soft white fragile crusts of acicular crystals <50 mm long. Its calculated density is 2.89 g cm3. Chemical analyses by energy dispersive spectrometry on a scanning electron microscope produced a mean elemental composition as follows: Ca, 18.99; Al, 18.55; Mg, 1.33; Na, 0.33; F, 50.20; O, 10.39; total 99.79 wt.%. The empirical chemical formula, calculated on the basis of 7 atoms per formula unit with all of the oxygen as OH, is (Ca0.73Mg0.09Na0.02)S0.84Al1.06F4.09(OH)1.01. Jakobssonite is monoclinic, space group C2/c, with a = 8.601(1), b = 6.2903(6), c = 7.2190(7) Å , b = 114.61(1)o, V = 355.09(8) Å3 and Z = 4. The crystal structure contains chains of [AlF6] octahedra which run parallel to the c axis. These chains are interconnected by chains of [CaF7] pentagonal bipyramids. Jakobssonite is isostructural with several other CaMIIIF5 compounds. The eight strongest lines in the powder diffraction diagram [d in Å (I) (hkl)] are as follows: 4.91 (18) (110), 3.92 (76) (200), 3.15 (68) (020), 3.13 (100) (1-1-2 ), 2.27 (22) (2-2-2 ), 1.957 (21) (400), 1.814 (20) (1-3-2), 1.805 (22) (20-4 ). The chemical and crystal-structure analyses of jakobssonite are similar to synthetic CaAlF5 with minor substitutions of light elements (e.g. Na) or vacancies for Ca, and OH for F.

U2 - 10.1180/minmag.2012.076.3.22

DO - 10.1180/minmag.2012.076.3.22

M3 - Journal article

VL - 76

SP - 751

EP - 760

JO - Mineralogical Magazine

JF - Mineralogical Magazine

SN - 0026-461X

IS - 3

ER -

ID: 49377830