Fig. 7
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Backscattered electron images showing textural occurrences of F-rich minerals in FA Li-pegmatites. (a-b) Bajoca petalite-rich pegmatite: amblygonite-group minerals (AGM) partially resorbed by muscovite, and secondary zinnwaldite overgrowths on muscovite; (b) Secondary F-apatite and Al-F-Sr-Ca phosphates (likely crandallite-goyazite: Cra) surrounding AGM. (c-d) Ramalha-E Li-mica-rich pegmatite (ALM-3): (c) topaz (Tpz), hosting K-feldspar inclusions, corroded by quartz and micas with muscovite to lepidolite compositions; (d) AGM partially replaced by Li-micas.
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