The Lece-Radan area of the Oligo-Miocene magmatic complex (former Tethyan active margin, southern Serbia) contains more or less altered volcanic and/or pyroclastic rocks of predominant andesitic, andesitic-dacitic, to dacitic composition. Alteration seen at exposures varies in type and intensity. Samples with documented alunitization were collected from hydrothermally altered zones embedded within local geological units of Oligo-Miocene age. Mineralogical-chemical study has confirmed for the first time the presence of alunite group minerals (thirty-one occurrences) in this area. The minerals of the alunite group described exhibit different compositions that are remarkably consistent with both different alteration types and host lithologies. Six samples characterized in detail show the following solid solutions: Alu₅₂Nal₄₃Hal₅, Alu₄₈Nal₄₀Hal₁₂, Nal₄₈Alu₃₅Hal₁₇, Nal₄₄Alu₃₅Hal₂₁, Alu₃₆Hal₃₃Nal₃₁ and Hal₄₆Alu₂₇Nal₂₇ (Alu, Nal and Sch refer to alunite, natroalunite and schlossmacherite, respectively). The cross-cutting alunite-bearing fracture pattern and its density indicate a high-sulphidation epithermal palaeoenvironment. The alunite discovery is consistent with the structural setting (fracture frequency) emphasizing its dominant role in controlling the local mineralization.

Oligo-中新世岩浆复合体的Lece-Radan地区（前特提斯活动边缘，塞尔维亚南部）或多或少地改变了火山岩和/或火山碎屑岩，这些火山岩和/或火山碎屑岩中主要为安山岩，安山岩-达吉克岩，直至形成了大山岩成分。暴露时看到的变化在类型和强度上都不同。从奥利哥-中新世时代的局部地质单元内埋藏的热液蚀变区收集了具有铝化作用的样品。矿物化学研究首次确认了该地区存在亚铝石族矿物（31次）。所述的亚铝石族矿物具有不同的组成，这些组成与不同的蚀变类型和基质岩性都非常一致。详细表征的六个样品显示以下固溶体：Alu ₅₂Nal ₄₃ Hal ₅，Alu ₄₈ Nal ₄₀ Hal ₁₂，Nal ₄₈ Alu ₃₅ Hal ₁₇，Nal ₄₄ Alu ₃₅ Hal ₂₁，Alu ₃₆ Hal ₃₃ Nal ₃₁和Hal ₄₆ Alu ₂₇ Nal ₂₇（Alu，Nal和Sch分别表示亚矾石，钠铝矾石和schlossmacherite）。横切含亚铝石的断裂模式及其密度表明高硫化度的超热古环境。亚矾石的发现与构造背景（断裂频率）相一致，强调了其在控制局部矿化中的主导作用。