Abstract
Potassic-aluminotaramite, ideally A K (CaNa) B (Fe 3 2+ Al 2 ) C (Si 6 Al 2 ) O 22 W (OH) 2 , has been found in a meta-monzonite rock sampled at Sierra de los Filabres, S.E. Spain; the paragenesis that contains the amphibole is mainly formed by feldspar, quartz, and clinopyroxene. This paper reports a complete mineral description and crystal-structure details for this new taramite end-member that has been recognised by IMA-CNMMC with the vote 2007-015. Holotype potassic-aluminotaramite has the experimental unit formula A (Na 0.34 K 0.66 ) ∑1.00 B (Fe 0.01 2+ Na 0.85 Ca 1.14 ) ∑2.00 C (Fe 2.80 2+ Mg 0.33 Al 1.26 Fe 0.46 3+ Ti 0.05 Mn 0.10 ) ∑5.00 T (Si 6.01 Al 1.99 ) ∑8.00 O 22 W (OH 1.96 F 0.03 Cl 0.01 ) ∑2.00 ; a = 9.8505(5), b = 18.0075(9), c = 5.3518(3) A, β = 104.775(4), V = 917.9(2) A 3 ; D calc = 3.40 g/cm 3 . Optics: biaxial (−); α 1.686(1), β 1.703(3), γ 1.706(3) (λ = 589 nm). The ten strongest reflections in the X-ray powder pattern [ d values (in A), I , ( hkl )] are: 8.420, 100, (110); 2.714, 75.03, (151); 2.565, 59.62, (−202); 3.127, 52.54, (310); 2.596, 49.03, (061); 3.400, 37.92, [(131) (041)]; 2.166, 33.71, [(261) (−332)]; 2.340, 32.38, (−351); 2.956, 24.79, (221); 2.297, 24.57, [(−171) (−312)].
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