Towards Zn-dominant Tourmaline: a Case of Zn-rich Fluor-Elbaite and Elbaite from the Julianna System at Piława Górna, Lower Silesia, SW Poland

Abstract

Abstract:Tourmalines are a group of minerals which may concentrate various accessory 16 components, e.g. Cu, Ni, Zn, Bi, Ti, Sn. The paper presents fluor-elbaite and elbaite from a dyke of 17 the Julianna pegmatitic system at Piława Górna, at the NE margin of the Bohemian Massif, SW 32(Zn2Al)Al6B3Si6O27(OH)3(OH) and Na(Zn2Al)Al6B3Si6O27(OH)3O. 33

Crystal structure and Raman spectroscopic studies of OH stretching vibrations in Zn-rich fluor-elbaite

“…In the original paper, the occurrence and compositional relationships of the tourmalines were described in detail, as well as a Raman spectrum of Zn-rich fluor-elbaite was presented. Unfortunately, in Pieczka et al (2018) the captions for Figures 9a and 9b presenting the Raman spectra of O-H stretching modes in Zn-rich fluor-elbaite and associated (Zn,Li)-bearing schorl in the range of 3400-3800 cm -1 were inadvertently switched, i.e. the caption (b) should be (a) and conversely, consistent with Figure presenting both these spectra in the range of 50-4000 cm -1 .…”

“…American Mineralogist, in press. DOI: https://doi.org/10.2138/am-2020-7360 fragment of the tourmaline were very similar one to the other in the range of OH stretching vibrations (3400-3800 cm -1 ), only one representative spectrum was resolved, the same that was presented and initially interpreted by Pieczka et al (2018).…”

“…The raw data were reduced with the PAP routine of Pouchou and Pichoir (1991). The estimation of the Li 2 O amounts from EPMA results on the basis of a multipleregression equation of Pesquera et al (2016) did not give positive result because the calculated Li 2 O amount (in wt%) is distinctly ZnO dependent for higher ZnO contents (Pieczka et al 2018).…”

Native silver in the eastern part of the Karkonosze granitoid pluton, Lower Silesia, Poland

“…Contemporary investigations indicate that they belong to (i) the euxenite, gadolinite, and allanite-monazite type of rare-elements -rare-earth-elements subclass (Matyszczak 2018), and (ii) the gadolinite-fergusonite type of the miarolitic-rare-earth-elements subclass (Evans et al 2018). The mineralogical characteristics of the Karkonosze pegmatites were published by Pieczka et al (2019; see also Sachanbiński 2021).…”

Mineral chemistry and genesis of monazite-(Sm) and monazite-(Nd) from the Blue Beryl Dyke of the Julianna pegmatite system at Piława Górna, Lower Silesia, Poland

“…The Blue Beryl Dyke, which was exposed in 2010, extended over a few tens of metres horizontally with a maximum thickness of ∼3-4 m. The zoning was typical up to the blocky unit with interstices among feldspars filled with quartz, but without a massive core. The characteristic features of the dyke were the presence of short prismatic crystals of pale-bluish low-Na,Cs beryl, abundant cassiterite and columbite-group minerals, and subordinate, few millimetre-sized, greenish crystals of gahnite associated with ferro-and zinconigerites-2N1S, (Al,Fe, Zn) 2 (Al,Sn) 6 O 11 (OH) and (Zn,Al,Fe) 3 (Al,Fe,Ti) 8 O 15 (OH), and -6N6S, (Al,Fe,Zn) 3 (Al,Sn,Fe) 8 O 15 (OH) and (Zn,Al) 7 (Al,Fe 3+ ,Ti, Mg) 16 O 31 (OH), as well as genthelvite, Be 3 Zn 4 (SiO 4 ) 3 S (Pieczka et al, 2019). Tourmaline-supergroup minerals were represented by Zn-enriched foitite, □(Fe 2+ 2 Al)Al 6 (Si 6 O 18 )(BO 3 ) 3 (OH) 3 (OH), evolving into schorl, NaFe 2+ 3 Al 6 (Si 6 O 18 )(BO 3 ) 3 (OH) 3 (OH); Li-bearing tourmalines were unique, occurring only as small dark greenish crystals of Fe-bearing elbaite, Na(Li 1.5 Al 1.5 ) Al 6 (Si 6 O 18 )(BO 3 ) 3 (OH) 3 OH, and fluor-elbaite, Na(Li 1.5 Al 1.5 ) Al 6 (Si 6 O 18 )(BO 3 ) 3 (OH) 3 F, in a few-centimetre-sized muscovite flakes, and as tiny inclusions in quartz and albite (Pieczka et al, 2018).…”