Parascandolaite, KMgF3, a new perovskite-type fluoride from Vesuvius

Demartin, Francesco; Campostrini, Italo; Castellano, Carlo; Russo, Mario Salvatore

doi:10.1007/s00269-014-0668-y

Cited by 22 publications

(18 citation statements)

References 19 publications

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“…Chemical analysis reveals partial replacement of F by OH, consistent with observations by Rosenberg on synthetic material [46]. Parascandolaite, Ve [47]: in colourless transparent sub-mm cubic crystals. Very rare.…”

Section: Halidessupporting

confidence: 86%

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Fumarolic Minerals: An Overview of Active European Volcanoes

Balić-Žunić¹,

Garavelli²,

Jakobsson³

et al. 2016

Updates in Volcanology - From Volcano Modelling to Volcano Geology

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The fumarolic mineralogy of the Icelandic active volcanoes, the Tyrrhenian volcanic belt (Italy) and the Aegean active arc (Greece) is investigated, and literature data surveyed in order to define the characteristics of the European fumarolic systems. They show broad diversity of mineral associations, with Vesuvius and Vulcano being also among the world localities richest in mineral species. Volcanic systems, which show recession over a longer period, show fumarolic development from the high-temperature alkaline halide/sulphate, calcic sulphate or sulphidic parageneses, synchronous with or immediately following the eruptions, through medium-temperature ammonium minerals, metal chlorides, or fluoride associations to the late low-temperature paragenesis dominated by sulphur, gypsum, alunogen, and other hydrous sulphates. The situation can be different in the systems that are not recessing but show fluctuations in activity, illustrated by the example of Vulcano where the high-temperature association appears intermittently. A full survey of the mineral groups and species is given in respect to their importance and appearance in fumarolic associations

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Section: Halidessupporting

confidence: 86%

“…The latter is identical to the synthetic compound of the same composition [53]. Coulsellite, Ve [47]: accompanies parascandolaite. Thermessaite [54] and thermessaite-(NH 4 ) [55] Vu: in medium temperature fumaroles (around 300°C) in sub-mm colourless prismatic crystals associated with alunite, sassolite, anhydrite, and metavoltine.…”

Section: Halidesmentioning

confidence: 90%

Fumarolic Minerals: An Overview of Active European Volcanoes

Balić-Žunić¹,

Garavelli²,

Jakobsson³

et al. 2016

Updates in Volcanology - From Volcano Modelling to Volcano Geology

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“…Parascandolaite crystals were confirmed in electron diffraction patterns and through chemical analysis. The electron diffraction patterns show a single crystal cubic pattern with a o = 0.39892 nm, which corresponds to the patterns of a mineral isotypic to cubic perovskite (Demartin et al 2014), and synthetic cubic KMgF 3 (Muradyan et al 1984), both with space group Pm 3m. However, all diffraction intensities are smeared out, appearing as if they are slightly rotated around a common zone axis [010] (Fig.…”

Section: Mineral Inclusions In Diamondmentioning

confidence: 97%

“…Such diffraction patterns can be the result of an assemblage of many nanocrystals that are slightly tilted or/and rotated against each other. Although "fluorperovskite" KMgF 3 is an important technological compound used in electro-optical applications, it was discovered in the natural environment only recently, as a volcanic sublimate at the Vesuvius volcano, Italy (Demartin et al 2014). According to experimental data, it is stable up to at least 40-50 GPa, keeping the cubic perovskite structure (Vaitheeswaran et al 2007, Aguado et al 2008.…”

Section: Mineral Inclusions In Diamondmentioning

confidence: 99%

A Microinclusion of Lower-Mantle Rock and Other Mineral and Nitrogen Lower-Mantle Inclusions in a Diamond

Kaminsky¹,

Wirth²,

Schreiber³

2015

Can Mineral

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A microcrystalline polymineral aggregate was identified as an inclusion in a diamond from the Rio Soriso area, Mato Grosso State, Brazil. It is composed of iron carbides, Fe-rich periclase (with exsolved magnesioferrite), and two orthorhombic, postspinel phases-Mg-Cr-Fe and Ca-Cr oxides, which are new mineral phases. This association was formed during several stages and may be considered as a rock microfragment from the lower mantle. In addition to the carbide-oxide fragment, other phases were identified as inclusions in the diamond, such as parascandolaite KMgF 3 (that is stable at pressures of up to 50 GPa) in association with orthorhombic MgO, and porous dolomite occurring together with nanoinclusions of calcite, apatite, spinel, Fe-sulfide, and an assemblage of periclase plus wüstite. These minerals belong to the carbonatitic association and, along with syngenetic nanoinclusions of fluid nitrogen, represent the media of diamond formation. The assemblage of periclase and wüstite within the carbonatitic matrix points to the origin of diamond from a carbonatitic environment within the lower mantle under pressure conditions of ≥85-86 GPa (~1,900 km depth).

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“…Neighborite NaMgF 3 [11] is isoelectronic and isostructural with MgSiO 3 ; the ratios of the formal cation charges are the same in both compounds (1:2) and the ratio of their ionic radii are about the same. KMgF 3 was until very recently known only as a synthetic crystal but has now been identified as the new mineral parascandolaite, found as a volcanic sublimate at Vesuvius [12]. KMgF 3 is a cubic perovskite (Figure 1a), while in NaMgF 3 there is an orthorhombic distortion such that the Mg-F-Mg bridges linking the MgF 6 octahedra are not linear ( Figure 1b).…”

Section: Introductionmentioning

confidence: 99%

PEROVSKITE SOLID SOLUTIONS - A MONTE CARLO STUDY OF THE DEEP EARTH ANALOGUE (K, Na)MgF3

2016

JSC

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Parascandolaite, KMgF3, a new perovskite-type fluoride from Vesuvius

Cited by 22 publications

References 19 publications

Fumarolic Minerals: An Overview of Active European Volcanoes

Fumarolic Minerals: An Overview of Active European Volcanoes

A Microinclusion of Lower-Mantle Rock and Other Mineral and Nitrogen Lower-Mantle Inclusions in a Diamond

PEROVSKITE SOLID SOLUTIONS - A MONTE CARLO STUDY OF THE DEEP EARTH ANALOGUE (K, Na)MgF3

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