Microlite-group minerals occur as common replacement products after primary and secondary columbite-group minerals (CGM) in albitised blocky K-feldspar and in coarse-grained, muscovite-rich units of the Schinderhübel I, Scheibengraben and Bienergraben beryl–columbite pegmatites in the Maršíkov District (Silesian Unit, Bohemian Massif, Czech Republic). Textural and compositional variations of microlite-group minerals were examined using electron probe micro-analyses and microRaman spectroscopy (μRS). A complex post-magmatic evolution of the pegmatites and the following microlite populations (Mic) and related processes were found: (1) precipitation of U, Na-rich and F-poor Mic I on cracks in CGM; (2) alteration of Mic I to U-rich together with Na- and F-poor Mic II; and (3) partial replacement of Mic I and II by Mic III with a distinct Na, U and Ti loss and Ca and F gain. Stage (2) includes an extensive leaching of Na, without U loss. The final stage (3) produced euhedral-to-subhedral oscillatory zoned Ca and F enriched Mic III with distinctly different composition to the previous F-poor and A-site vacant Mic II. Aggregates of fersmite are associated commonly with Mic III. Distal Mic IIId occurs locally on cracks in K-feldspar or quartz, with compositions analogous to Mic III. Compositional variations and textural features of microlite-group minerals during dissolution–reprecipitation processes serve as sensitive tracers of post-magmatic evolution in granitic pegmatites recording complex interactions between magmatic pegmatite units and externally derived, hydrothermal metamorphic fluids.

微晶石族矿物作为原生和次生铌铁矿族矿物 (CGM) 之后的常见替代产物出现在 albitised 块状钾长石和粗粒、富含白云母的单元 Schinderhübel I、Scheibengraben 和 Bienergraben 绿柱石-铌铁矿伟晶岩中Maršíkov 区（捷克共和国波西米亚地块的西里西亚区）。使用电子探针显微分析和显微拉曼光谱 (μRS) 检查微晶石族矿物的结构和成分变化。发现了伟晶岩和以下微晶岩群 (Mic) 以及相关过程的复杂的岩浆后演化： (1) 在 CGM 裂缝上沉淀出富含 U、Na 和 F 的 Mic I；(2) 将 Mic I 改变为富含 U 以及 Na-和 F-贫乏的 Mic II；(3) 用具有不同 Na 的 Mic III 部分替换 Mic I 和 II，U 和 Ti 损失以及 Ca 和 F 增加。阶段 (2) 包括 Na 的广泛浸出，而没有 U 损失。最后阶段 (3) 产生了自形到半自形振荡区带 Ca 和 F 富集的 Mic III，其成分与之前的 F-poor 和 F-poor 明显不同。A站点空置麦克风 II。铁矿的聚集体通常与 Mic III 相关。远端 Mic IIId 局部出现在钾长石或石英的裂缝上，其成分类似于 Mic III。溶解-再沉淀过程中微晶岩群矿物的成分变化和结构特征作为花岗岩伟晶岩岩浆后演化的敏感示踪剂，记录了岩浆伟晶岩单元与外部衍生的热液变质流体之间的复杂相互作用。