Deynekoite, Ca9 Fe3+(PO4)7 - a new mineral of the merrillite group from phosphide-bearing contact facies of paralava, Hatrurim Complex, Daba-Siwaqa, Jordan

Evgeny V. Galuskin, Marcin Stachowicz, Irina O. Galuskina, Krzysztof Woźniak, Yevgeny Vapnik, Mikhail N. Murashko, Grzegorz Zieliński

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2 Scopus citations

Abstract

Deynekoite, {equation presented}, a new mineral of the merrillite group was found in a contact facies of paralava of the Hatrurim Complex in the Daba-Siwaqa pyrometamorphic rock field, Jordan. The paralava, consisting of diopside, tridymite, anorthite, wollastonite and fluorapatite, is enriched in Febearing phosphides and phosphates at the contact with the altered country rock. Cristobalite overgrowing tridymite has a texture of the fish scales-type indicating that temperature of paralava could have reached 1500°C. Deynekoite with empirical formula {equation presented} forms transparent, light-yellow or light-brown grains up to 30-40 μm in size. Microhardness of deynekoite VHN25 = 319(29) kg/mm2 , that coresponds to the Mohs hardness = 4.5. Its density was calculated as 3.09 g·cm-3 on the basis of its empirical composition and structural data. Deynekoite is uniaxial (-), its refractive indices are Ω = 1.658(3), ϵ = 1.652(3) (λ = 589 nm), and pleochroism is not observed. The formation of phosphides on the boundary of the paralava and country rock is connected with carbothermal reductive reactions and realized at temperatures above 1300°C. With decreasing temperature and increasing oxygen activity, phosphides are replaced by Fe2+-bearing phosphates. Deynekoite, which contains Fe3+ (substituting for Fe2+ -phosphates) and a small amount of water, formed at temperatures of 600-800 °C.

Original languageEnglish
JournalMineralogical Magazine
DOIs
StateAccepted/In press - 1 Jan 2023

Keywords

  • Hatrurim Complex
  • Jordan
  • deynekoite
  • merrillite
  • paralava

ASJC Scopus subject areas

  • Geochemistry and Petrology

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