Si-Pimpure Al-goethite mineralization on the island of Dugiotok (Central Adria tic, Croatia

Branimir ŠegviĆ, Boško Lugović, Neven Tadej, Vladimir Bermanec, Lovro Panjkota

Research output: Contribution to journalArticlepeer-review


At the western seaward coast of the island of Dugi otok, unusual goethite mineralization occurs as the infilling of a system of thin crevices in the Upper Cretaceous limestones of the Adriatic carbonate platform. Goethite is exceptionally well ordered and shows a variety of chemical compositions rangingfrom almost pure FeOOH to Al-substituted composition accompanied by high Si andP impurity. The most characteristic textural type assemblages are goethite and coarse grained calcite in composite aggregates. These aggregates contain Al-substituted goethite with metamor- phic silicate minerals embedded in the core (black goethite), armoured by theXRD-pure, almost stoichiometric goethite (brown goethite). The geochemical and mineralogical features of the mineralization suggest an ascending solution from a hidden metamorphic source. We speculate that the source could have been activated by the thermal influx linked to the Pliocene intraplate magmatism in the eastern segment of Adria.

Original languageEnglish
Pages (from-to)19-26
Number of pages8
JournalGeologia Croatica
Issue number1
StatePublished - 2008


  • Adria microplate
  • Adriatic Sea
  • Al-goethite
  • Croatia
  • Crystalochemistry
  • Dugi otok
  • Endogenic origin
  • Stoichiometric goethite


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