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Surprise eggs, the miracle of nature: Almus agates (Tokat – Turki̇ye)

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PL
Jaja niespodzianka, cud natury: agaty Almus (Tokat – Turcja)
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EN
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EN
Almus agates which are forms of nodules like egg-shaped are located in the Eocene aged Almus volcanics in Tokat (Turkey). These nodules are surprise eggs in spherical or oval form ranging from a few cm to 25-30 cm. It is thought that the most effective reason for the formation of the magnificent texture and color combinations of the agates in the region is the iron element. In thin section studies, agate formations are composed of length-slow zebraic chalcedony and quart zine. In addition, curved fossil like structures composed of iron oxide minerals offer visual richness. The host rock in which the Almus agates are located is trachyte, which consists of sanidine, plagioclase microlites and small opaque minerals, in which microlithic porphyritic and flow (trachytic) texture are observed. As a result of the multipoint eds (field emission scanning electron microscope), it was determined that the quartz is composed of Si, O and Fe. The content of the iron element, which is thought to cause color, was observed in the range of ca 1–1.5 wt.%. According to XRF analysis results, in Almus agates, there is depletion of Fe2O3 content in fine crystalline regions (ca 1 wt.%) compared to coarse crystalline zones (ca 1.5 wt.%). In order to determine the usability of Almus agates as gemstone, various cabochon shapes were made in Ümit Ulus Gemstone Processing workshop. It has been observed that these agates can be used for both collection and gemstone purposes due to their unique patterns and color compensation.
PL
Agaty Almus, które mają formę guzków jajowatych i znajdują się w eoceńskich wulkanach Almus w Tokat (Turcja). Te guzki to jaja niespodzianki w kształcie kulistym lub owalnym, o wielkości od kilku do 25-30 cm. Uważa się, że najskuteczniejszym powodem powstawania wspaniałej faktury i kombinacji kolorów agatów w regionie jest pierwiastek żelaza. W badaniach cienkich przekrojów, formacje agatowe składają się z zebrowego chalcedonu i kwarcytu. Ponadto zakrzywione struktury przypominające skamieliny, złożone z minerałów tlenku żelaza, zapewniają wizualne bogactwo. Skała macierzysta, w której znajdują się agaty Almus, to trachit, na który składają się sanidyna, mikrolity plagioklazowe oraz drobne minerały nieprzezroczyste, w których obserwuje się mikrolityczną teksturę porfirytową i przepływową (trachytyczną). W wyniku wielopunktowego EDS (skaningowego mikroskopu elektronowego z emisją polową) ustalono, że kwarc składa się z Si, O i Fe. Zaobserwowano zawartość pierwiastka żelaza, o którym sądzi się, że powoduje barwę, w zakresie od około 1 do 1,5% wag. Zgodnie z wynikami analizy XRF, w agatach Almus następuje zmniejszenie zawartości Fe2O3 w obszarach drobnokrystalicznych (około 1% wag.) w porównaniu do obszarów gruboziarnistych (około 1,5% wag.). Aby określić przydatność agatów Almus jako kamieni szlachetnych, w pracowni Ümit Ulus Gemstone Processing wykonano różne kształty kaboszonów. Zaobserwowano, że te agaty mogą być używane zarówno do celów kolekcjonerskich, jak i kamieni szlachetnych ze względu na ich unikalne wzory i kompensację kolorów.
Twórcy
  • Kırşehir Ahi Evran University, Faculty of Engineering and Architecture, Kirşehi̇, Turkey
  • Mersin University, School of Technology and Design of Jewelry, Çiftlikköy, Mersi̇,Turkey
  • Kırşehir Ahi Evran University, Faculty of Engineering and Architecture, Kirşehi̇, Turkey
Bibliografia
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Uwagi
PL
Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023)
Typ dokumentu
Bibliografia
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