Potassic-aluminotaramite from Sierra de los Filabres, Spain

Roberta Oberti, Massimo Boiocchi, David C. Smith, Olaf Medenbach, Henk Helmers

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Potassic-aluminotaramite, ideally AK (CaNa)B (Fe23+Al2)C (Si6Al2) O22W (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(Na0.34K0.66)∑1.00 B(Fe2+0.01Na0.85 Ca1.14)∑2.00C (Fe2+2.80Mg0.33Al1.26 Fe3+0.46Ti0.05 Mn0.10)T∑5.10(Si6.01 Al1.99)∑8.00O22W (OH1.96F0.03Cl0.01) ∑2.00; a = 9.8505(5), b = 18.0075(9), c = 5.3518(3) Å β = 104.775(4), V = 917.9(2) Å3; Dcalc = 3.40 g/cm3. 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 Å), 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)].

Original languageEnglish
Pages (from-to)1005-1010
Number of pages6
JournalEuropean Journal of Mineralogy
Volume20
Issue number6
DOIs
StatePublished - 2008
Externally publishedYes

Keywords

  • Amphibole
  • Chemical analysis
  • Crystal structure
  • New mineral
  • Potassic-aluminotaramite
  • Spain

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