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The mineralogical composition of the zeolitic rocks of Santorini Island and their potential use as feed additives and nutrition supplements

Published online by Cambridge University Press:  17 October 2024

Christina Mytiglaki Open the ORCID record for Christina Mytiglaki [Opens in a new window] ,
Soultana Kyriaki Kovaiou ,
Dimitrios Vogiatzis ,
Nikolaos Kantiranis Open the ORCID record for Nikolaos Kantiranis [Opens in a new window]  and
Anestis Filippidis Open the ORCID record for Anestis Filippidis [Opens in a new window]
Christina Mytiglaki
Affiliation:
Department of Mineralogy–Petrology–Economic Geology, School of Geology, Faculty of Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
Soultana Kyriaki Kovaiou
Affiliation:
Department of Mineralogy–Petrology–Economic Geology, School of Geology, Faculty of Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
Dimitrios Vogiatzis
Affiliation:
Department of Mineralogy–Petrology–Economic Geology, School of Geology, Faculty of Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
Nikolaos Kantiranis*
Affiliation:
Department of Mineralogy–Petrology–Economic Geology, School of Geology, Faculty of Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
Anestis Filippidis
Affiliation:
Department of Mineralogy–Petrology–Economic Geology, School of Geology, Faculty of Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
*
Corresponding author: Nikolaos Kantiranis; Email: [email protected]
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Abstract

The zeolitic rocks of Akrotiri, on Santorini Island (Aegean Sea, Greece), can be grouped according to the zeolite minerals present. The first group includes zeolitic rocks that contain only clinoptilolite, the second group contains clinoptilolite and mordenite and the third group contains only mordenite. Clinoptilolite accounts for up to 56 wt.% and mordenite for up to 69 wt.% of the rocks. All samples contain feldspars (8–36 wt.%), clay minerals (6–8 wt.%), quartz (3–6 wt.%), opal-CT (2 wt.%), amphibole (2–4 wt.%) and amorphous materials (4–7 wt.%). The studied samples were classified chemically as andesites or dacites. The ammonium-exchange capacity of the studied samples was 104–158 meq 100 g–1. According to Commission Implementing Regulation (EU) No. 651/2013, zeolitic rocks that contain ≥80 wt.% clinoptilolite, ≤20 wt.% clay minerals and are free of fibrous minerals and quartz can be used as feed additives in animal husbandry. Zeolites with fibrous habit (mordenite, erionite, secondarily roggianite and mazzite) and SiO2 minerals such as quartz, cristobalite and tridymite can be dangerous to both humans and animals. The mineralogical study showed that, due to their low clinoptilolite content and the presence of both quartz and fibrous mordenite, the studied zeolitic rocks do not conform with European Regulation No. 651/2013. As a result, their use as feed additives and nutrition supplements is prohibited.

Keywords

clinoptilolitefeed additivesfibrous zeolitesmordenitenutrition supplementsSantorini
Type
Article
Information
Clay Minerals , Volume 59 , Issue 3 , September 2024 , pp. 192 - 201
Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland

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Footnotes

Editor: George Christidis

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