Hellandite-(Y)–hingganite-(Y)–fluorapatite retrograde coronae: a novel type of fluid-induced dissolution–reprecipitation breakdown of xenotime-(Y) in the metagranites of Fabova Hoľa, Western Carpathians, Slovakia

Abstract

This is a 'preproof' accepted article for Mineralogical Magazine. This version may be subject to change during the production process.

New Mineral Names

“…Xenotime-(Gd) (IMA2023-091; Xtm-Gd), ideally GdPO 4 , is a new mineral found in the Zimná Voda vein, Slovenské Rudohorie (Slovak Ore Mountains), 5.6 km south of the village of Prakovce and 400 m northwest of Trohanka bivouac shelter, Košice Region, Slovakia (Ondrejka et al 2024). Like other members of the xenotime group, the new mineral is tetragonal, I4 1 /amd; its cell parameters are: a = 6.9589( 5), c = 6.0518(6) Å.…”

Minerals, crystal structures and geochemistry

“…Martin Ondrejka, Alexandra Molnárová, Marián Putiš, Peter Bačík, Pavel Uher, Bronislava Voleková, Stalislava Milovská, Tomáš Mikuš and Libor Pukančík in the article ‘Hellandite-(Y)-hingganite-(Y)-fluorapatite retrograde coronae: a novel type of fluid-induced dissolution-reprecipitation breakdown of xenotime-(Y) in the metagranites of Fabova Hol'a, Western Carpathians, Slovakia' analyse the formation of secondary coronae, containing crystals of hellandite-(Y) [(Ca,REE) 4 Y 2 Al□ 2 (B 4 Si 4 O 22 )(OH) 2 ] and hingganite-(Y) [Y 2 □Be 2 Si 2 O 8 (OH) 2 ], that developed around rare-earth element (REE) phosphates in metagranitic rocks, resulting from the activity of external origin fluids probably from adjacent magmatic, metamorphic or sedimentary rocks (Ondrejka et al ., 2022).…”

Monazite-(Gd), a new Gd-dominant mineral of the monazite group from the Zimná Voda REE–U–Au quartz vein, Prakovce, Western Carpathians, Slovakia

“…Monazite-(Gd) is the Gd-dominant member of the monazite group, related to monazite-(La), monazite-(Ce), monazite-(Nd) and monazite-(Sm) by substitution of Gd for other REE and having the REE composition distinctly shifted towards the MREE. The new mineral was approved in accordance with recommendations of the IMA–CNMNC (IMA2022-055; Ondrejka et al , 2022) and the Levinson modifier for rare earth minerals (Levinson, 1966; Bayliss and Levinson, 1988). The symbol Mnz-Gd was given to the new mineral.…”