... minerals (allanite, aeschynite, titanite); very rare milarite IV (milarite s.s. to agakhanovite) as prismatic crystals and thin overgrowths with complex oscillatory zoning, ≤200 μm in size, on crystals of milarite II and milarite III. Their mineral assemblages, textures and compositions suggest primary...

... in late-stage albite zones near the core of the Upper Høydalen pegmatite which is one of the chemically most evolved pegmatites of the Tørdal field. Scandium concentrations of the investigated garnets range from 14 to 2197 ppm. The highest Sc concentrations are found in garnets from the Heftetjern 1...

..., was discovered in two occurrences. The holotype was found in a granitic pegmatite associated with rodingite-like calc-silicate rocks and metasomatised granitic bodies exposed in a serpentinite quarry at Jordanów Śląski near Sobótka, Lower Silesia, SW Poland. The cotype comes from the Heftetjern pegmatite, Tørdal...

... in the beryl group, ideally Cs(LiBe 2 )Al 2 Si 6 O 18 , which has Be 3 of ordinary beryl replaced in an ordered fashion by LiBe 2 ( Laurs et al. , 2003 ). The Heftetjern bazzite can be compared to an unusual, blue beryl from Arizona which has 6.68 wt.% Cs 2 O, relatively low Li 2 O (0.23 wt.%) and high FeO...

..., it is reasonable to assume, that Sc-minerals at the localities Heftetjern, Baveno and Kožichovice II originated during similar primary solidus and subsolidus processes. However, F activity was very low in Kožichovice II, indicating the F complexation is not needed for the formation of secondary Sc-minerals...

...Gunnar Raade ABSTRACT Helvine-group minerals from two granitic pegmatites have disparate compositions, from nearly pure helvine (Ågskardet, northern Norway; Devonian) to helvine close to ternary compositions (Heftetjern, southern Norway; Precambrian). Metagranite from Høgtuva (northern Norway...

...A. J. Lussier; M. A. Cooper; F. C. Hawthorne; R. Kristiansen Abstract Two crystals from a sample of titanite from the Heftetjern granitic pegmatite, Tørdal, southern Norway, were extracted for structure analysis and shown to have triclinic symmetry. Unit-cell parameters are as follows: a = 7.0696(4...

...Uwe Kolitsch; Roy Kristiansen; Gunnar Raade; Ekkehart Tillmanns Abstract Heftetjernite, ideally ScTaO 4 , is a new scandium mineral from the Heftetjern pegmatite, Tørdal, Telemark, Norway. In the type specimen, it occurs as minute, elongate tabular, very dark brown crystals in a single small void...

...Ritsuro Miyawaki; Koichi Momma; Kazumi Yokoyama; Masako Shigeoka; Satoshi Matsubara; Miku Ito; Izumi Nakai; Roy Kristiansen Abstract Mn-bearing hellandite-(Y) occurs as pinkish yellow granular crystals (up to sub mm) in the Sc-rich granite pegmatite at Heftetjern, Tørdal, Telemark, Norway...

...Mark A. Cooper; Frank C. Hawthorne; Neil A. Ball; Petr Černý; Roy Kristiansen Abstract Oftedalite, ideally (Sc,Ca,Mn 2+ ) 2 K (Be,Al) 3 Si 12 O 30 , is a new mineral species from the Heftetjern granitic pegmatite, northwest of the small parish of Tørdal, southern Norway. It occurs as short...

...Frank C. Hawthorne; Yassir A. Abdu; Neil A. Ball; Petr Černý; Roy Kristiansen Abstract Agakhanovite-(Y), ideally (YCa)□ 2 KBe 3 Si 12 O 30 , is a new milarite-group mineral from the Heftetjern pegmatite, Tørdal, southern Norway. Crystals are prismatic along [001], and show the forms {100} and {100...

...), quartzite, and greywacke-dominated metasedimentary rocks ( Starmer 1985 , 1991 , Knudsen et al . 1997 , de Haas et al . 1999 , Andersen et al . 2004 , Nijland et al . 2014 ). Minor rock units comprise the gabbro-tonalite complex of Tromøy, granite-charnockite metaplutons, pegmatites, and late...

...; black; RRUFF database R090022, https://rruff.info/ ). Kozłowskiite and silesiaite originate from the Szklarska Poręba Huta quarry, kristiansenite from the Heftetjern pegmatite, Tørdal, Telemark, Norway. Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf...

... to minasgeraisite-(Y) to conform to the International Mineralogical Association (IMA) rules of nomenclature for rare-earth minerals (Bayliss and Levinson 1988 )] as a new member of the gadolinite group, from the zoned complex of the Jaguaraçu granitic pegmatite, in the Mr. José Pinto quarry, Jaguaraçu, Minas...

.... A detailed inspection of thin sections and BSE images reveals that beryl from Kožichovice II pegmatite underwent a complex processes of alteration; the following mineral assemblages have been distinguished. Assemblage I (secondary beryl II + bavenite + bazzite + smectite), examined in detail in this paper...

... and single-crystal X-ray diffraction. Fluorine has an important role as a complexing agent for Y and REE s in supercritical pegmatitic fluids; annite-siderophyllite and chamosite are the most likely sources of the Y and REE s. The thortveitite from Baveno contains up to 3.20 wt.% SnO 2 , an unusually high Sn...

... these characteristics of end-member formulae with aspects of their crystal structures can lead to unambiguous definition of end-member compositions of complex minerals, and can give considerable insight into coupled heterovalent substitutions. Several examples are given. The end-member formula of the tourmaline-group...

... indicate the importance of complexes in enhancing the different geochemical behavior of scandium with respect to the REE , and that of equilibria with species such as feldspars, where aluminum cannot be replaced by transition elements. Abstract Nous signalons pour la première fois la présence de...

... of the A.E. Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia. Zagi Mountain is a low hill, about 3 × 5 km in extent, rising 150 to 200 m above the surrounding plain. The bedrock is part of the Warsak igneous complex ( Fig. 1 ), which is itself a part of the Peshawar...

... Mont Saint-Hilaire (MSH). These localities are regarded as co-type localities. The Aris phonolite is a dike that intrudes metasedimentary rocks of the Paleoproterozoic Hohewarte complex. It is a fine-grained aphyric rock, composed mainly of sanidine, nepheline, and aegirine with minor haüyne...