Mineralogical background of Alinci locality, North Macedonia

Boev, Ivan and Bermanec, Marko (2022) Mineralogical background of Alinci locality, North Macedonia. In: 18th Serbian Geological Congress "Geology solves the problems", 01-04 June 2022, Divcibare, Serbia.

Text MINERALOGICAL BACKGROUND OF ALINCI LOCALITY, NORTH.pdf Download (1MB)

Abstract

One of the most interesting aspects of Crn Kamen mineralogy is the presence of several oxide
phases, some of which are extremely rare in nature. The first mentioned oxide found on this locality,
apart from quartz, is davidite Ce(Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH,F)38 which was described by Damjanović
and Vukasović, (1961). Fragments of former larger crystals estimated up to 15 cm in size were found in
a cavity of the crushed and weathered syenites. Bermanec et al., (1990) analyzed the samples of the
same crystal samples and determined that it is actually a uranium rich metamictic senaite
Pb(Mn,Y,U)(Fe,Zn)2(Ti,Fe,Cr,V)18(O,OH)38. However, even that was not the correct determination.
Wülser et al., (2005) found a mineral of a similar, uranium rich composition in the western Swiss Alps
which was not metamictic. This enabled them to see that the uranium is a species defining cation and
they named the new mineral cleusonite (Pb,Sr)(U4+,U6+)(Fe2+,Zn)2(Ti,Fe2+,Fe3+)18(O,OH)38. It was
mentioned that the samples from Crn Kamen also correspond to metamictic cleusonite, not senaite or
davidite (Wülser et al., 2005; Biagioni et al., 2014). Brannerite UTi2O6 was also found in the silicified
parts of the fine-grained Quartz syenits in the direction of Topolčane (Vukasović and Mihajlović-Vlaić
1963). In addition to these rare phases, large rutile crystals as well as hematite, ilmenite and magnetite
can be found (Barić, 1965). Possibly the most peculiar aspect of the Crn Kamen mineralogy is the
mineral macedonite PbTiO3 which was first described here as well (Radusinović and Markov, 1971).

Item Type:	Conference or Workshop Item (Other)
Subjects:	Natural sciences > Earth and related environmental sciences
Divisions:	Faculty of Natural and Technical Sciences
Depositing User:	Ivan Boev
Date Deposited:	09 Aug 2022 11:08
Last Modified:	09 Aug 2022 11:08
URI:	https://eprints.ugd.edu.mk/id/eprint/29963

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