Eldfellite, NaFe(SO4)2, a new fumarolic mineral from Eldfell volcano, Iceland
作者： T. Balić-Žunic , A. Garavelli , P. Acquafredda , E. Leonardsen , S. P. Jakobsson
DOI: 10.1180/MINMAG.2009.073.1.51
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摘要: A new mineral, eldfellite, was found among fumarolic encrustations collected in 1990 on the Eldfell volcano, Heimaey Island, Iceland. Associated minerals are ralstonite, anhydrite, gypsum, bassanite, hematite, opal and tamarugite, as well a presumably mineral with composition Na 3 Fe(SO 4 ) . Along eldfellite forms soft fragile aggregates built of thin, platy crystals micrometre size. The is yellowish-green to greenish-white, white streak. calculated density 3.062 g/cm Eldfellite monoclinic, C 2/ m, 8.043(4) A, b 5.139(2) c 7.115(4) β 92.13(2)°, V uc 293.9(2) , Z = 2 isostructural yavapaiite [KFe(SO ]. strongest lines powder diffraction diagram [ d (A), I (relative 10)]: 3.72, 8; 3.64, 5; 3.43, 2.77, 10; 2.72, 6; 2.57, 3; 2.370, 1.650, 3. chemical analysis X-ray data correspond those synthetic compound NaFe(SO
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