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Ore potential of acidic rocks of the Achean Kolmozero-Voronya zone, NE Baltic Shield
Published in Adam Piestrzyński, Mineral Deposits at the Beginning of the 21st Century, 2001
The pegmatite veins are accompanied by intensive geochemical anomalies of rare metals (Li, Cs, Rb) and zonal metasomatic alteration. The exocontact zonation is displayed in the following way: re-crystallized hornblendite amphibolites (1); holmquistite- hornblendite amphibolites (2); biotiteholmquistite- hornblendite rocks (3); biotite rocks with zoisite (4); tourmalinite with apatite and (rare) muscovite (5); pegmatite vein (6). Holmquistite is the typomorphic mineral of the exocontact alteration zones. The thickness of the inner zones (4 and 5) does not exceed a few tens centimetres, the outer zones are up to 10 m in thickness.
Lithium in pegmatites of the Fennoscandian Shield and operation prospects for the Kolmozero deposit on the Kola Peninsula (Russia)
Published in Applied Earth Science, 2022
P. V. Pripachkin, N. M. Kudryashov, T. V. Rundkvist, L. N. Morozova
The first discovery of lithium pegmatites in Sweden was made in 1818 by J.A. Arfwedson. The lithium was determined in petalite from the Utö pegmatite in the Stockholm archipelago. Nyköpingsgruvan and Långgruvan iron and sulphide mines were active in the seventeenth century. NYF- and LTC-type pegmatites occur among the Nyköpingsgruvan iron formation of Palaeoproterozoic age. Since seizing production the mines were abandoned and partially filled with water. The LCT-pegmatites exploited from these mines contain several lithium-bearing minerals, including spodumene, petalite, holmquistite (Grew et al. 2018).
Assessing the Lithium Potential of the Paleoproterozoic Rocks of the West African Craton; the Case so Far
Published in Geosystem Engineering, 2023
Lithium mineralization within the Dibilo pegmatites occurs as spodumene ([SiO3]2 LiAl), molybdenite, lepidolite ([Si3 (Si, Al) O10 (OH, F) 2] KAl (Li, Fe, Al)), Holmquistite (Li2 (Mg, Fe2+) 3Al2Si8O22 (OH) 2), scheelite colombo – tantalite, beryl and gold (Machens, 1961; Attourabi et al., 2021). The concentration of lateral spodumene crystals can range from a few percent to seventy percent in the finest portions. Spodomenite’s concomitant lithiniferous minerals are lepidolite and the lithiniferous amphibole holoquistite. Quartz, muscovite, feldspar, and accessory garnet are typical minerals. Spodumene and petalite are distinct phases of the Li2O – Al2O3 - SiO2 system and are accurate paleobarometers (London, 1984). The predominant subtype of complex pegmatites is spodumene, which crystallises predominantly at relatively high pressures (3 to 4 kbar) and low temperatures. The more uncommon subtype of petalite solidifies at slightly higher temperatures and lower pressures (1.5 to 3 kbar) (Linnen et al., 2012). Dibilo pegmatites are of the Rare Element (RE) class, complex variety, spodumene subtype, and LCT family. Allou (2005) reports that within the pegmatites of West Central la Côte d’Ivoire, the Nb, Ta, and Be mineralizations is characterized by albite and microcline, while Li mineralization is associated with greisens. Adingra et al. (2023) add that the pegmatites in the southeast of La Côte d’Ivoire belong to the complex type albite-spodumene. The albite is the most evolved and has the particularity of being the most lithium-rich. There is also the probable presence of beryl and spodumene-type mineralization in the muscovite-garnet-bearing pegmatite (Adingra et al., 2023).