Mineralogical, geochemical and gemological investigation of Artova Ch-chalcedonies, Tokat – Turkey

• Autorzy: Başıbüyük Zeynel , Akbudak Ilkay Kaydu , Gürbüz Meltem

Identyfikatory

DOI

10.24425/gsm.2020.132551

Warianty tytułu

PL

Mineralogiczne, geochemiczne i gemologiczne badania Ch-chalcedonów z Artova, Tokat – Turcja

• Języki publikacji: EN

Abstrakty

EN

Ch-chalcedony is a green colored member of the quartz group of gem stones. The appearance of Ch-chalcedony is very similar to that of chrysoprase. Differently, Ch-chalsedonies have a chromium element instead of a nickel element as a trace element. Green quartz used in jewelery as a seal stone, in necklaces and rings and has been one of the most valuable quartz varieties throughout history, with its beautiful green color, more rare than other quartz varieties. The Ch-chalcedonies in the North Anatolian region is yellowish-white, brownish gray, light green to dark green in color ranging from several centimeters to one meter thick in veins and lenses in the Lower-Middle Eocene dolomitic limestones. Ch-chalcedonies are composed of fine-grained and occasionally fibrous needle-like quartz; in some examples, quartz is present together with cristobalite, tridimite and cuspidine minerals. According to geochemical investigations in Ch-chalcedonies, the main oxides that were determined are as follows: SiO₂ was observed in the range of 95.86–97.81%, Fe₂O₃ was observed in the range of 0.61–0.91% and Cr₂O₃ was observed in the range of 0.125–0.168%. A trace element analysis of Ch-chalcedonies, shows their significant enrichments in: Ni, Mo, Cu, Mn, V, Cr and W, especially in the Cr (up to 705 ppm). The green color of the studied Cr-chalcedonies originates from the element chromium. Taking the possible reserves into account, the hardness, color, massive structures, mineralogical, petrographical and gemological features of Ch-chalcedonies in the region are evaluated together. It is determined that they are suitable for the production of jewelry and ornaments.

PL

Ch-chalcedon jest składnikiem kwarcowej grupy kamieni szlachetnych w kolorze zielonym. Wygląd Ch-chalcedonu jest bardzo podobny do chryzoprazu. W szczególności Ch-chalcedony zawierają pierwiastek chromu zamiast pierwiastka niklu jako pierwiastka śladowego. Zielony kwarc stosowany w biżuterii jako kamień do: pieczętowania, naszyjników i pierścionków był jedną z najcenniejszych odmian kwarcu w historii dziejów. Ch-chalcedony w regionie północnoatlantyckim mają żółtawo-biały, brązowo-szary kolor od jasnozielonego do ciemnozielonego o grubości od kilku centymetrów do jednego metra, występują w żyłach i soczewkach wapieni dolomitycznych dolno-środkowego eocenu. Ch-chalcedony składają się z drobnoziarnistego i czasami włóknistego igłopodobnego kwarcu; w niektórych próbkach kwarc występuje razem z minerałami krystobalitu, tridymitu i kuspidyny. Według badań geochemicznych w Ch-chalcedonach zawartość głównych tlenków kształtowała się następująco: SiO₂ zaobserwowano w zakresie 95,86–97,81%, Fe₂O₃ zaobserwowano w zakresie 0,61–0,91%, a Cr₂O₃ zaobserwowano w zakresie 0,125–0,168%. Analiza pierwiastków śladowych Ch-chalcedonów pokazuje ich znaczące wzbogacenie w: Ni, Mo, Cu, Mn, V, Cr i W, szczególnie w Cr (do 705 ppm). Zielony kolor badanych Ch-chalcedonów pochodzi od pierwiastka chromu. Obecnie oceniane są: możliwe zasoby, twardość, kolor, struktury, cechy mineralogiczne, petrograficzne i gemologiczne chalcedonów w analizowanym regionie. Ustalono, że te Ch-chalcedony nadają się do produkcji biżuterii i ozdób.

Słowa kluczowe

EN

Ch-chalcedony; gemstone; green quartz; gemology; Turkey

PL

Ch-chalcedon; kamień szlachetny; zielony kwarc; gemologia; Turcja

• Wydawca: Instytut Gospodarki Surowcami Mineralnymi i Energią PAN ; Komitet Zrównoważonej Gospodarki Surowcami Mineralnymi PAN
• Czasopismo: Gospodarka Surowcami Mineralnymi
• Rocznik: 2020
• Tom: T. 36, z. 1
• Strony: 77--92
• Opis fizyczny: Bibliogr. 36 poz., rys., tab., wykr.

Twórcy

autor

Başıbüyük Zeynel

• Ahi Evran University, Turkey; ORCID iD: 0000-0003-2845-148X

autor

Akbudak Ilkay Kaydu

• Ahi Evran University, Turkey

autor

Gürbüz Meltem

• Mersin University, Turkey

Bibliografia

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Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).