ANTUNES, I.M.H.R. ; NEIVA, A.M.R. ; SILVA, M.M.V.G. (2007) - Geochemistry of minerals from Li-bearing granitic aplite-pegmatite veins of Segura area (Castelo Branco, Portugal). In Granitic Pegmatites : The State of the Art - International Symposium, 6, Porto, 6-12 May - Book of abstracts. Porto : FCUP. p. 28-29. Comunicação.
Title
Geochemistry of minerals from Li-bearing granitic aplite-pegmatite veins of Segura area (Castelo Branco, Portugal)
Li-bearing granitic aplite-pegmatite veins containing muscovite, montebrasite, natromontebrasite, lepidolite, topaz,cassiterite and manganocolumbite crop out in Segura area. Primary lepidolite contains more F, Rb and less Al than primary muscovite. Primary natromontebrasite has more Na, F and less Li and OH than montebrasite. Cassiterite is zoned showing sequences of alternating parallel darker and lighter zones. The darker zones are strongly pleochroic, oscillatory zoned, show exsolved Manganocolumbite and have more Nb and Ta than the lighter zones. Manganocolumbite is oscillatory zoned.
