...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...

... with a = a 0 , b = b 0 and c = c 0 ; P 2/ c ; the members are ferberite, hübnerite, huanzalaite, sanmartinite, heftetjernite, nioboheftetjernite, rossovskyite and riesite]; samarskite type [samarskite-group minerals; a = 2 a 0 , b = b 0 and c = c 0 ; P 2/ c ; the members are samarskite-(Y), ekebergite...

...(22)(100), 3.776(22)(011), 3.628(44)(110), , 2.938(83)(111), 2.472(30)(021), and . The crystal structure, refined from single-crystal X-ray diffraction data ( R 1 = 0.016), is of the “wolframite” type. The mineral is named as the Nb-analogue of heftetjernite, ScTaO 4 . §   Corresponding author...

...Fig. 1 Backscattered-electron images of subhedral crystals of hydrokenopyrochlore. In (a), associated minerals are quartz, orthoclase, and tiny euhedral inclusions of an undetermined heftetjernite-like mineral. In (b), hydrokenopyrochlore is associated with quartz, a mica-group mineral...

.... Because of its behavior garnet is, besides mica, the major host for Sc in the pegmatites. In addition, various Sc minerals have been described from the Tørdal pegmatites including bazzite, cascandite, heftetjernite, kristiansenite, oftedalite, scandiobabingtonite, and thortveitite ( Raade et al . 2002...

...TABLE 8. COMPARISON OF SHAKHDARAITE-(Y), SAMARSKITE-(Y), BROOKITE, IWASHIROITE-(Y), HEFTETJERNITE, AND NIOBOHEFTETJERNITE ...

... in the Mineralogical Museum of Leoben, Austria (catalog number 8241). The holotype (the crystal chosen for the X-ray powder diffraction work) is housed at the Canadian Museum of Nature (CMNMC 86089). K.T.T. U. Kolitsch, R. Kristiansen, G. Raade, and E. Tillmanns (2010) Heftetjernite, a new scandium mineral...

... was an accomplished field and lab geologist who developed techniques for improved gold extraction techniques from low concentration gold ore and for measuring gases in rare earth metals. Nioboheftetjernite ( Lykova et al. 2021 ), ideally ScNbO 4 , is named for being the niobium analog of heftetjernite (ScTaO 4...

... Ti 0.04) Σ1.05 O 4 . The ratio Ta/(Ta + Nb) = 0.26–0.39 and Mn/(Fe+Mn) = 0.31–0.46 (Fig. 3), whereas Sc contents vary between 0.50 and 0.64 apfu (14.08–17.98 wt.% of Sc 2 O 3), Table 4 . Kolitsch et al. (2010) assigned Ti into the octahedral site in chemically related heftetjernite, ScTaO 4...

... mineral assemblage, present mainly in vugs and fractures, comprises agakhanovite-(Y), bazzite, bertrandite, bohseite, cascandite, Ce–La–Sc-enriched epidote–allanite minerals, Y-rich fluorite, heftetjernite, Mn-bearing hellandite-(Y), Sc-rich helvine, triclinic Ca-hingganite-(Y), Sc-rich garnet, oftedalite...

...+  = Total trivalent cations, M 4+  =Total tetravalent cations, M 5+  = Total pentavalent cations, M 6+  =Total hexavalent cations; WfG = wolframite group; SmkG = samarskite group; Fer = ferberite, Hbr = hübnerite, Hza = huanzalaite, Sma = sanmartinite, Hef = heftetjernite, Nhef = nioboheftetjernite...

... ( Raade et al . 2002b ), oftedalite ( Cooper et al . 2006 ), and heftetjernite ( Kolitsch et al . 2010 ). Intergrowths of several Sc silicates were described by Raade & Erambert (1999) and by Raade et al . (2004a) . Minor amounts of Sc are incorporated in a number of the accessory minerals...

... . Kolitsch , U. , Kristiansen , R. , Raade , G. , & Tillmans , E. ( 2010 ) Heftetjernite, a new scandium mineral from the Heftetjern pegmatite, Tørdal, Norway. European Journal of Mineralogy 22 , 309 – 316 . Kristiansen , R. ( 2009 ) A unique assemblage of Scandium...

..., cascandite ( Raade and Erambert, 1999 ), thortveitite ( Kristiansen, 2003 ; Raade et al ., 2004 ) and the new minerals kristiansenite ( Raade et al ., 2002 ), oftedalite ( Cooper et al ., 2006 ; Kristiansen, 2005 ) and heftetjernite ( Kolitsch et al ., 2009 ; Kristiansen, 2009 ). There are ∼60 mineral...

... Norway at 59°8.6′N, 8°45.4′E, about 4.8 km NW of the small parish of Tørdal at an altitude of ca . 650 m above sea level. It is the type locality of oftedalite, kristiansenite, heftetjernite, and agakhanovite-(Y). The pegmatite consists dominantly of cleavelandite, partly amazonitic microcline, quartz...