Orschallite, Ca3(SO3)2SO4 · 12H2O, a new calcium-sulfite-sulfate-hydrate mineral

Weidenthaler, C.; Tillmanns, E.; Hentschel, G.

doi:10.1007/BF01163095

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Orschallite, Ca₃(SO₃)₂SO₄· 12H₂O, a new calcium-sulfite-sulfate-hydrate mineral

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Weidenthaler, C., Tillmanns, E., & Hentschel, G. (1993). Orschallite, Ca₃(SO₃)₂SO₄· 12H₂O, a new calcium-sulfite-sulfate-hydrate mineral. Mineralogy and Petrology, 48(2-4), 167-177. doi:10.1007/BF01163095.

引用: https://hdl.handle.net/11858/00-001M-0000-0024-2210-F

要旨

The new mineral orschallite, Ca₃(SO₃)₂SO₄· 12H₂O, was found at the Hannebacher Ley near Hannebach, Eifel, Germany. Crystal structure analysis of the mineral, chemical analysis and water determination on synthetic material gave the composition Ca₃(SO₃)₂SO₄· 12H₂O. The mineral crystallizes in space group R3̅c with a = 11.350(1), c = 28.321(2) Å, V = 3159.7 Å³, Z = 6, D_c = 1.87 Mg/m³, D_m = 1.90(3) Mg/m³. It is uniaxial positive with the optical constants ω = 1.4941, ɛ = 1.4960(4). The strongest lines in the powder pattern are (d-value (Å), I, hkl) 5.73, 100, 1 0 4/8.11, 80, 0 1 2/2.69, 80, 3 0 6/3.63, 60, 1 1 6/3.28, 40, 3 0 0. Refinement of the crystal structure led to a weighted residual of R_w = 0.043 for 600 observed reflections with I > 2σ(I) and 52 variable parameters.