Alf Olav Larsen's scientific contributions
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Publications (14)
Peterandresenite (IMA2012-084), ideally Mn4Nb6O19·14H2O, is the first naturally occurring hexaniobate. It was found at the AS Granit larvikite quarry in Tvedalen, Larvik, Vestfold, Norway, by private collector Peter Andresen, after whom the mineral is named. The mineral was found on fracture surfaces and in tiny vugs in the centre of a miaskitic pe...
The major and trace element geochemistry of mafic silicate minerals from alkaline pegmatites within the 10 ring sections of the Larvik plutonic complex, Oslo rift, southern Norway, have been studied to shed light on the complex evolutionary history of the pegmatites. Pyroxene compositions plot within the aegirine-diopside-hedenbergite ternary diagr...
Agpaitic nepheline syenites have complex, Na-Ca-Zr-Ti minerals as the main hosts for zirconium and titanium, rather than zircon and titanite, which are characteristic for miaskitic rocks. The transition from a miaskitic to an agpaitic crystallization regime in silica-undersaturated magma has traditionally been related to increasing peralkalinity of...
![FIG. 4. Ferrochiavennite : approximately [010] projection showing the H...](profile/Henrik-Friis-3/publication/258960049/figure/fig2/AS:613971564453904@1523393636376/Ferrochiavennite-approximately-010-projection-showing-the-H-2-O-groups-with-H-bonds_Q320.jpg)
Ferrochiavennite is a new beryllium silicate zeolite with chemical composition close to Ca1–2FeSi5Be2O13(OH)2·2H2O. It is described from two syenite pegmatite localities in Norway: Blåfjell, Langangen, Telemark, and the AS Granit larvikite quarry, Tvedalen, Vestfold. The mineral is monoclinic, P21/c, with a 8.759(5), b 4.864(2), c 31.258(6) Å, β 90...
Agpaitic nepheline syenites have complex, Na-Ca-Zr-Ti minerals as the main hosts for zirconium and titanium, rather than zircon and titanite, which are characteristic for miaskitic rocks. The transition from a miaskitic to an agpaitic crystallization regime in silica-undersaturated magma has traditionally been related to increasing peralkalinity of...
A detailed electron microprobe (EMP) and laser-ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) study of zircon from six types of miaskitic and agpaitic alkaline pegmatite from the Larvik Plutonic Complex, Oslo rift valley, Norway, was undertaken to shed light on the pegmatite petrogenesis. Detailed rare earth element (REE) analyse...
Agpaitic nepheline syenites contain complex zirconium silicate minerals as primary magmatic phases; agpaitic liquidus mineral assemblages are controlled by compositional parameters such as alkalinity and concentrations of water and halogens in the magma. The Larvik Plutonic Complex in the late Palaeozoic Oslo Rift, Norway consists of hypersolvus mo...
Heulandite-Ba, ideally (Ba,Ca,Sr,K,Na) 5 Al 9 Si 27 O 72 ·22H 2 O, is a new zeolite species in the heulandite series, occurring as an accessory mineral in hydrothermal veins of the Kongsberg silver deposit type at the Northern Ravnås prospect, southern Vinoren, 14 km NNW of Kongsberg town, Kongsberg ore district, Flesberg community, Buskerud county...
The insufficiently studied beryllium silicate sphaerobertrandite has been known since 1957. The present work presents new findings, verifies that the mineral is a valid species with a unique structure. The original name sphaerobertrandite has been kept in spite of its unjustifiable connection to bertrandite. The mineral is named after the typical s...
The composition of 135 samples of astrophyllite-group minerals from 15 localities has been established by EMPA, ICP-AES, FTIR, TGA, thermal decomposition, NRA and Mössbauer spectroscopy. A standardized general formula has been developed and is of the form A2BC7D2T8O26(OH 4X0-1, where [10]-[13]A = K, Rb, Cs, H3O+, H2O, Na or □; [10]B = Na or Ca; [6]...
The relatively rare mineral calcio-ancylite-(Ce) has been found in abundance in a syenite pegmatite at Tuften larvikite quarry at Tvedalen, Oslo Region, Norway. The mineral formed as a result of hydrothermal alteration of fluorapatite, and occurs as crystal aggregates in hollow, tubular casts after apatite crystals. The mode of occurrence and parag...
Ilvaite occurs in Permian veins transecting Proterozoic granitic gneisses on the southwestern flank of the Late Paleozoic Oslo Graben, Norway. The mineral occurs in hydrothermal quartz-magnetite veins in association with hedenbergite, andradite, fluorite and calcite. Ilvaite as an accessory mineral in hydrothermal veins is a very unusual mode of oc...
Citations
... The CMS is designed to address the evolution of the wide range of calc-alkaline pegmatites of granitic composition, including the affiliated rocks of intermediate (granodioritic) and more basic gabbroic compositions. Only different by their geodynamic setting, pegmatites of the alkaline clan, which are represented by syenitic pegmatites or even agpaitic and miaskitic associates, such as nepheline syenites (e.g., Larvik, Norway, Khibiny, Russia, Zr-REE-P nepheline syenite pegmatite) can be classified by means of the CMS (PEKOV 2000, ARZAMASTSEV et al. 2008, ANDERSEN et al. 2013. ...
... Similar amphibole evolution trend has also been reported in the Strange Lake peralkaline pluton, Canada (e.g. Siegel et al. 2017), the Khibiny complex in the Kola Peninsula, Russia (Konopleva et al. 2008), Ilímaussaq in southern Greenland (Marks et al. 2004), and the alkaline pegmatites of the silica-undersaturated to -saturated Larvik plutonic suite of the Oslo Rift in Southern Norway (Piilonen et al. 2013). ...
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... Furthermore, mineral assemblages and compositions may give relevant clues to access the main intensive parameters of these crystallisation environments, as well as the alkalinity and volatile fugacities in the magma (e.g. Nichols and Carmichael, 1969;Marks et al., 2011;Andersen et al., 2010;Siachoque et al., 2022). ...
... The deposits are characterized by complex mineralogy. The most common primary hosts for Nb, Zr and REE are eudialyte group minerals, loparite, apatite, titanite, rinkite group minerals, zircon or baddeleyite, and wöhlerite group minerals (Marks et al., 2008;Andersen et al., 2010;Andersen et al., 2013;Linnen et al., 2014;Tukiainen, 2014;Kalashnikov et al., 2016;Marks and Markl, 2017). Table 1 lists the Zr and Nb minerals mentioned in text and tables including their formulas and typical occurrences. ...
... One Mn 2+ octahedron interconnects three Lindqvist ions to form a two-dimensional layer perpendicular to the c-axis. A second Mn 2+ octahedron bridging with the Lindqvist ion protrudes into the adjacent layer along the c-axis and creates a three-dimensional structure via hydrogen bonds [183]. ...
Reference: The fascinating polyoxometalates
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... Wöhlerite crystals in contact with this late magmatic assemblage typically show in situ alteration to secondary pyrochlore, zircon and fluorite. Pegmatites in the classical Langesundsfjord archipelago do not contain any primary zircon, but can contain other Zr-silicates (låvenite, eudialyte group minerals, hiortdahlite, rosenbuschite) with or without association with wöhlerite (Brøgger, 1890;Andersen et al., 2010;Piilonen et al., 2012;Sunde et al., 2018;Sunde et al., 2019). Wöhlerite is absent in miaskitic pegmatites (with primary zircon + pyrochlore + ilmenite assemblages), which are related to quartz-bearing monzonites. ...
... More than 100 of these occur in the AS Granit and Tuften larvikite quarries at Tvedalen, Larvik, and Vestfold. A comprehensive list of minerals found in the LPC is maintained and updated as new phases are identified (Grice et al. 2013, Friis et al. 2014, 2017, Sokolova et al. 2017. This list consists of major minerals and numerous rare minerals, including economically important phases such as those enriched in REE, Be, and F (Müller et al. 2017). ...
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... Astrophyllite is the main mineral of the astrophyllite supergroup, which encompasses thirteen minerals divided into three groups based on crystal-chemical criteria, namely astrophyllite, kupletskite and devitoite groups (Sokolova et al., 2017). Their crystal-chemical properties have been broadly discussed (Cámara et al., 2010;Piilonen et al., 2003aPiilonen et al., , 2003bSokolova, 2012;Sokolova et al., 2017;Sokolova and Cámara, 2008). Sokolova et al. (2017) In the astrophyllite group, the HOH blocks connect via D-X D P -D bridges, and Fe 2+ is the dominant cation in the C site. ...
... This structural feature has a lot in common with chains in many structures of beryllium minerals, where the core of the chain is formed by Be tetrahedra. However, in such minerals, the bonds between the neighboring Be tetrahedra are re-inforced by Si tetrahedra [e.g., euclase, AlBe(SiO 4 )(OH) (Mrose & Appleman 1962), and sphaerobertrandite, Be 3 SiO 4 (OH) 2 (Pekov et al. 2003)] or by (001) (Dahm & Adam 2002). The structures of all these compounds differ significantly from the structure of niveolanite. ...
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... Mn-rich species occurs exclusively in marblehosted distal Zn-(Pb) skarn deposits, and is closely associated with Mn-rich clinopyroxene (hedenbergite-johannsenite) ± rhodonite exoskarn minerals [5,9]. In contrast, the Fe-rich species occurs in Fe, Au, Sn and W skarn deposits, and is associated with exoskarn minerals [10−12]. ...
