Javorieite, KFeCl3: a new mineral hosted by salt melt inclusions in porphyry gold systems

Identification of anhydrous CaCl2 and KCaCl3 in natural inclusions by Raman spectroscopy

“…The prime analytical technique is here the Raman spectroscopy that provides a quick, non-destructive and easy available identification method for their identification by comparison with published Raman spectra of chlorides (see recent reviews of Frezzotti et al, 2012 andHurai et al, 2015). Furthermore, reference spectra of several other synthetic chlorides have been reported just recently: CaCl 2 (Uriarte et al, 2015), K 3 NaMnCl 6 (Kurosawa et al, 2016) and KFeCl 3 (Kod ra et al, 2017). However, there is still a lack of published Raman spectra of some less common minerals hosted in fluid inclusions or the published spectra of synthetic minerals are different from those found in fluid inclusions for some reasons.…”

Ferrous hydroxychlorides hibbingite [γ-Fe2(OH)3Cl] and parahibbingite [β-Fe2(OH)3Cl] as a concealed sink of Cl and H2O in ultrabasic and granitic systems

“…The inclusions contain commonly a greenish or pale greenyellowish phase of a tabular habit whose Raman spectrum corresponds to the spectra of the hibbingite-like mineral in brine inclusions, presented above. The diagnostic Raman spectrum of the hibbingite-like mineral was determined in salt melt inclusions from four different localities in two stratovolcanoes: Biely Vrch, Králová and Slatinské Lazy in the Javorie stratovolcano, Slovakia (Koděra et al 2017), as well as Beluj in the Štiavnica stratovolcano, Slovakia (Kozák et al 2017 and this study; Table 1; Fig. 1e-i).…”

“…A hibbingite-like phase was also determined as an abundant daughter mineral hosted by salt melt, liquid-free inclusions that occur in several porphyry gold systems in the Central Slovak Volcanic Field (Koděra et al 2017, Kozák et al 2017. Salt melt inclusions represent a rare type of fluid inclusion, where the entire volume of the inclusion is occupied by several salt crystals and a distorted vapor bubble (Koděra et al 2014).…”

Application of Raman spectroscopy for identification of rinneite (K3NaFeCl6) in inclusions in minerals

“…Consequently, Fe-bearing daughter minerals are quite common in high-salinity brine and salt melt inclusions from magmatic-hydrothermal systems. In brine inclusions, they are usually represented by hydrated chlorides (typically FeCl 2 Á2H 2 O), oxides (magnetite, hematite), or hydroxides [hibbingite (Fe 2 (OH) 3 Cl)], whereas in salt melt inclusions, they can also form anhydrous Febearing chlorides [javorieite (KFeCl 3 ) and rinneite] [8,9]. However, the Fe-bearing chlorides are difficult to identify by optical properties and destructive analytical methods, as they are extremely unstable in air.…”

“…The available reference Raman spectra of these minerals are mostly limited to Fe-oxides and hydrated Fe-bearing chlorides [8,13]. Recently, Koděra et al [14] published the Raman spectrum of javorieite (KFeCl 3 ), which is the most common Fe-bearing daughter mineral in salt melt inclusions from porphyry gold systems. In this study, we present new data on rinneite (K3NaFeCl6), a rare anhydrous Fe-bearing chloride mineral.…”