Pretulite, ScPO<sub>4</sub>; a new scandium mineral from the Styrian and Lower Austrian lazulite occurrences, Austria

Bernhard, Franz; Walter, Franz; Ettinger, Karl; Taucher, J; Mereiter, Kurt

doi:10.2138/am-1998-5-622

Cited by 40 publications

(17 citation statements)

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“…Indeed, such minerals, subtracting F from fl uids, impose the precipitation of phases rich in rare metals. Recently, other agents, such as CO 3 2-, SO 4 2-, PO 4 3-, F -, Cl -, and OH -, have been advocated for the genesis of Sc minerals in different geochemical environments such as carbonatites (Liferovich et al 1998) and metamorphic rocks (Bernhard et al 1998;Möelo et al 2002).…”

Section: Discussionmentioning

confidence: 99%

“…Two main rock types hosting Sc minerals, characterized by strongly contrasting geochemistry, have been recognized: granitic pegmatites belonging to the NYF (niobium-yttrium-fl uorine) Family, and rarely to the LCT (lithium-cesium-tantalum) Family, of the Černý (1991) classifi cation (e.g., Behier 1960;Bergstøl and Juve 1988;Gramaccioli et al 1998;Novák and Černý 1998), and carbonatites (e.g., Eby 1973;Åmli 1977;Liferovich et al 1998). Moreover, in a few cases, Sc minerals also have been observed in Alpine-type hydrothermal veins in metamorphic environments (e.g., Armbruster et al 1995;Bernhard et al 1998), and lowtemperature hydrothermal veins and supergene environments in ore deposits (e.g., Postl 1981).…”

Section: Introductionmentioning

confidence: 99%

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Scandium silicates from the Baveno and Cuasso al Monte NYF-granites, Southern Alps (Italy): Mineralogy and genetic inferences

Pezzotta

Diella

Guastoni

2005

American Mineralogist

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Recent studies (e.g., Gramaccioli et al. 2000a and references therein) suggest that the formation of fl uoride complexes plays an important role in the transport and enrichment of Sc, Y, and the lanthanides in fl uids. However, many problems still exist in our understanding of the geochemical behavior of such elements * ABSTRACT A chemical and paragenetic study has been performed on Sc silicates and Sc-bearing beryl occurring in Hercynian NYF-miarolitic pink granite and granophyric leucogranite at Baveno and Cuasso al Monte, Western Southern-Alps, Italy. In the Baveno and Cuasso al Monte plutons, detailed fi eld work allowed the discovery of a signifi cant number of crystals of bazzite, thortveitite, scandiobabingtonite, cascandite, and jervisite representative of all the known morphological and color varieties of these minerals in the two localities. Other studied samples belong to the historic collections of the Natural History Museum of Milan.Except for beryl, which crystallizes relatively early in aplitic granophyre, all the other Sc minerals crystallize as late-stage phases in cavities associated with fl uorite. Chemical analyses reveal moderate Sc enrichment at the rim of beryl crystals. Bazzite displays a relatively large chemical variation, from "primitive" compositions enriched in Fe 2 O 3 and Al 2 O 3 , to "highly evolved" compositions with values of Sc 2 O 3 up to 17.54 wt%. Scandiobabingtonite shows a perfect inverse correlation between Fe 3+ and Sc concentrations, suggesting complete solid solution between babingtonite and its Sc analogues. A wide variety of compositions have been determined for cascandite, signifi cantly extending the compositional range of this mineral. In particular, the MnO content ranges from 0.37 to 4.87 wt%. The jervisite crystals analyzed in this work have rather homogeneous compositions much closer to the end-member if compared with the holotype analysis reported in literature. Thortveitite shows a wide range of compositions with variation in Sc 2 O 3 , Y 2 O 3 , HREE, and Fe 2 O 3 . Signifi cant fl uctuations of the Sc/Yb ratios are in agreement with similar complex variations in the ratios between REE (e.g., Y/Dy) reported in the literature for crystals of gadolinite-group minerals from the same localities.Two different genetic models are discussed to explain the precipitation of Sc silicates as late stage phases in cavities. (1) during the latest stages of magma crystallization, HFSE and Sc were extracted from the silicate liquid and partitioned into fl uids due to the complexing effect of F. Indeed, in view of the NYF geochemistry of the granite and the signifi cant abundance of the associated F-bearing minerals, fl uorides (but not other complexing agents such as carbonates and phosphates) played the major role in concentrating HFSE and Sc. In cavities, such elements resulted in a series of rare accessory phases when F was extracted from fl uids because of the precipitation of zinnwaldite and fl uorite. (2) HFSE, Sc, and Y+REE were mainly incorporated by gadolinite-(Y...

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Scandium silicates from the Baveno and Cuasso al Monte NYF-granites, Southern Alps (Italy): Mineralogy and genetic inferences

Pezzotta

Diella

Guastoni

2005

American Mineralogist

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“…The apparent surplus on the A-site could be explained by the entrance of substantial amounts of interstitial cations (e.g., Fe, Ca, Al, As, Bi, Sc) [40,41]. Sc enrichment in zircon is usually explained via the pretulite (ScPO 4 ) exchange [42]. However, rational evaluation of non-formula elements enrichment in zircon is always matter of discussion.…”

Section: Substitution In Zirconmentioning

confidence: 99%

REE and Y Mineralogy of the Krudum Granite Body (Saxothuringian Zone)

René

2018

Minerals

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Abstract:The Krudum granite body comprises highly fractionated granitic rocks ranging from medium-F biotite granites to high-F, high-P 2 O 5 Li-mica granites. This unique assemblage is an ideal site to continue recent efforts in petrology to characterize the role of zircon, monazite, and xenotime as hosts to rare earth elements (REEs). The granitic rocks of the Krudum body analyzed in this study were found to contain variable concentrations of monazite and zircon, while xenotime was only found in the high-F, high-P 2 O 5 Li-mica granites and in the alkali-feldspar syenites of the Vysoký Kámen stock. Intermediate trends between cheralite and huttonite substitutions are characteristic for analyzed monazite grains from all magmatic suites. The highest concentration of cheralite was found in monazite from the alkali-feldspar syenites (up to 69.3 mol %). The proportion of YPO 4 in analyzed xenotime grains ranges from 71 to 84 mol %. Xenotime grains are commonly enriched in heavy rare earth elements (HREEs; 9.3-19.5 wt % HREE 2 O 3 ) and thorite-coffinite and cheralite exchange was observed. Some xenotime analyses return low totals, suggesting their hydration during post-magmatic alterations. Analyzed zircon from granite suites of the Krudum granite body contains moderate Hf concentrations (1.0-4.7 wt % HfO 2 ; 0.010-0.047 apfu Hf). The highest concentrations of HfO 2 were found in zircon from the high-F, high-P 2 O 5 Li-mica granites (1.2-4.7 wt % HfO 2 ). Analyzed zircon grains from the high-F, high-P 2 O 5 Li-mica granites and alkali-feldspar syenites are enriched in P (up to 8.29 wt % P 2 O 5 ; 0.24 apfu P), Al (0.02-2.0 wt % Al 2 O 3 ; 0.00-0.08 apfu Al), Ca (up to 3.9 wt % CaO; 0.14 apfu Ca), Y (up to 5.5 wt % Y 2 O 3 ; 0.10 apfu Y), and Sc (up to 1.17 wt % Sc 2 O 3 ; 0.03 apfu Sc). Zircon grains from the high-F, high-P 2 O 5 Li-mica granites were sometimes hydrated and fluorized. The concentrations of F in zircon from partly greisenised high-F, high-P 2 O 5 Li-mica granites reached up to 1.2 wt % (0.26 apfu F).

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“…The apparent surplus on the A-site could be explained by occurring substantial amounts of interstitial cations (e.g., Fe, Ca, Al, As, Bi, Sc) [34][35]. For enrichment of the Sc in zircon the pretulite (ScPO4) exchange is usually suggested [36]. The moderate to strong deviation of altered zircons from stoichiometry was also found in some other occurrences of the high-F, Li-mica granites in the Krušné Hory/Erzgebirge area (e.g.…”

Section: Substitution In Zirconmentioning

confidence: 99%

REE and Y Mineralogy of the Krudum Granite Body (Saxothuringian Zone)

René¹

2018

Preprint

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The Krudum granite body comprises highly fractionated granitic rocks ranging from medium-F biotite granites to high-F, high-P2O5 Li-mica granites. This unique assemblage is an ideal site to continue recent efforts in petrology to characterize the role of zircon, monazite and xenotime as hosts to REEs. The granitic rocks of the Krudum body analysed in this study were found to contain variable concentrations of monazite and zircon, while xenotime was only found in the high-F, high-P2O5 Li-mica granites and in the alkali-feldspar syenites of the Vysoký Kámen stock. For analysed monazites of all magmatic suites cheralite substitution was significant. The highest concentration of cheralite was found in monazites from the high-F, Li-mica granites and from the alkali-feldspar syenites. The proportion of YPO4 in all analysed xenotimes ranges from 71 to 84 mol. %. Some xenotimes were found to be hydrated and the observed water content estimated from analytical data ranged from 5 to 11 wt. % H2O. Preprints (www.preprints.org) | NOT PEER-REVIEWED | Analysed xenotimes were commonly enriched in HREEs (9.3-19.5 wt. % HREE2O3) and thorite-coffinite and cheralite exchange was observed. Analysed zircons from granite suites of the Krudum granite body contained moderate Hf concentrations (1.0-4.7 wt. % HfO2; 0.010-0.047 apfu Hf). The highest concentrations of HfO2 were found in zircons from the high-F, high P2O5 Li-mica granites (1.2-4.7 wt. % HfO2) and from the alkalifeldspar syenites (1.3-4.1 wt. % HfO2). Zircons from the high-F, high-P2O5 Li-mica granites were often hydrated and fluorised. The concentrations of F in zircon from partly greisenised high-F, high-P2O5 Li-mica granites reached up to 1.2 wt. % (0.26 apfu F). In zircons from the alkali-feldspar syenites enrichment in P, which is not associated with a simultaneous enrichment in Y + REE, was also observed. Analysed zircons from the high-F, high P2O5 Li-mica granites were enriched in Y (up to 5.5 wt. % Y2O3; 0.10 apfu Y) and Sc (up to 1.17 wt. % Sc2O3; 0.03 apfu Sc).

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Pretulite, ScPO₄; a new scandium mineral from the Styrian and Lower Austrian lazulite occurrences, Austria

Cited by 40 publications

References 4 publications

Scandium silicates from the Baveno and Cuasso al Monte NYF-granites, Southern Alps (Italy): Mineralogy and genetic inferences

Scandium silicates from the Baveno and Cuasso al Monte NYF-granites, Southern Alps (Italy): Mineralogy and genetic inferences

REE and Y Mineralogy of the Krudum Granite Body (Saxothuringian Zone)

REE and Y Mineralogy of the Krudum Granite Body (Saxothuringian Zone)

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Pretulite, ScPO4; a new scandium mineral from the Styrian and Lower Austrian lazulite occurrences, Austria

Cited by 40 publications

References 4 publications

Scandium silicates from the Baveno and Cuasso al Monte NYF-granites, Southern Alps (Italy): Mineralogy and genetic inferences

Scandium silicates from the Baveno and Cuasso al Monte NYF-granites, Southern Alps (Italy): Mineralogy and genetic inferences

REE and Y Mineralogy of the Krudum Granite Body (Saxothuringian Zone)

REE and Y Mineralogy of the Krudum Granite Body (Saxothuringian Zone)

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Pretulite, ScPO₄; a new scandium mineral from the Styrian and Lower Austrian lazulite occurrences, Austria