| Plain Text | Giester, Gerald, Rieck, Branko (1995) Mereiterite, K2Fe[SO4]2·4H2O, a new leonite-type mineral from the Lavrion Mining District, Greece. European Journal of Mineralogy, 7 (3) 559-566 doi:10.1127/ejm/7/3/0559 |
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| Abstract/Notes | Mereiterite is a new mineral from the Hilarion adit, Lavrion Mining District, Greece. It occurs as subhedral crystals, included in gypsum, and is further associated with limonite and smithsonite, found in one large pocket in marble. The transparent, non-fluorescent, pale yellow crystals show vitreous lustre and are very brittle without observed cleavage. Optics: biaxial (+) with nα, nß, and nγ= 1.497(1), 1.501(1), and 1.509(1), respectively, and with observed 2Vα = 73(5)°. Moris' hardness 21/2-3; dobs. = 2.36(1), dcalc. = 2.358 g-cm-3. Chemistry by ICP, EDX and TG: empirical formula (ICP, TG, based on 12 oxygens p.f.u.) K1.94Fe1.07S1.99O8.01·3.99H2O, ideally K2Fe[SO4]2 · 4H2O. The crystal structure was determined by single crystal X-ray methods in space group C2/m, a = 11.841(3) A, b = 9.553(2) Å, c = 9.942(2) Å, ß = 94.87(1)°, V = 1120.6 Å3 and Z = 4. The strongest lines in the X-ray powder diffraction pattern (with refined lattice parameters a = 11.844(1) Å, b = 9.556(1) Å, c = 9.947(1) Å, ß = 94.90(1)°, are: (dobs[Å]/Iobs/hkl) (4.778/30/0 2 0), (3.505/52/3 1 -7), (3.440/100/0 2 2), (3.331/48/5 1 1), (3.051/29/2 2 -2), (2.405/30/2 2 3), (2.390/49/0 4 0+11 -4), (1.961612216 0 0) and (1.7202/22/0 4 4). The crystal structure of mereiterite was refined to R = 0.025 for 2115 unique reflections with sinθ/λ < 0.8 Å-1. It is isotypic to that of leonite, K2Mg[SO4]2·4H2O. The new mineral is named for Dr. Kurt Mereiter of the Technical University of Vienna. |
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