New mineral with modular structure derived from hatruritefrom the pyrometamorphic rocks of the hatrurim complex: Ariegilatite, BaCa12(SiO4)4(PO4)2F2O, from Negev desert, Israel

Evgeny V. Galuskin, Biljana Krüger, Irina O. Galuskina, Hannes Krüger, Yevgeny Vapnik, Justyna A. Wojdyla, Mikhail Murashko

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12 Scopus citations

Abstract

Ariegilatite, BaCa12(SiO4)4(PO4)2F2O (R(formula presented)m, a = 7.1551(6) Å, c = 41.303(3) Å, V = 1831.2(3) Å3, Z = 3), is a new member of the nabimusaite group exhibiting a modular intercalated antiperovskite structure derived from hatrurite. It was found in a few outcrops of pyrometamorphic rocks of the Hatrurim Complex located in the territories of Israel, Palestine and Jordan. The holotype specimen is an altered spurrite marble from the Negev Desert near Arad city, Israel. Ariegilatite is associated with spurrite, calcite, brownmillerite, shulamitite, CO3-bearing fluorapatite, fluormayenite-fluorkyuygenite and a potentially new mineral, Ba2Ca18(SiO4)6(PO4)3(CO3)F3O. Ariegilatite is overgrown and partially replaced by stracherite, BaCa6(SiO4)2[(PO4)(CO3)]F. The mineral forms flat disc-shaped crystals up to 0.5 mm in size. It is colorless, transparent, with white steaks and vitreous luster. Optically, ariegilatite is uniaxial, negative: ω = 1.650(2), ε = 1.647(2) (λ = 589 nm). The mean composition of the holotype ariegilatite, (Ba0.98K0.01Na0.01)Σ1(Ca11.77Na0.08Fe2+0.06Mn2+0.05Mg0.04)Σ12(Si3.95Al0.03Ti0.02)Σ4(P1.70C0.16Si0.10S6+0.03V0.01)Σ2F2.04O0.96, is close to the end-member formula. The structure of ariegilatite is described as a stacking of the two modules {F2OCa12(SiO4)4}4+ and {Ba(PO4)2}4 along (001). Ariegilatite, as well as associated stracherite, are high-temperature alteration products of minerals of an early clinker-like association. These alterations took place under the influence of pyrometamorphism by-products, such as gases and fluids generated by closely-spaced combustion foci.

Original languageEnglish
Article number109
JournalMinerals
Volume8
Issue number3
DOIs
StatePublished - 8 Mar 2018

Keywords

  • Ariegilatite
  • CO-group
  • Crystal structure
  • Hatrurim Complex
  • Intercalated hexagonal antiperovskite
  • Nabimusaite group
  • New mineral
  • Pyrometamorphic rocks
  • Raman

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geology

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