Naslov
Pietra ollare (chlorite-schist) artefacts from Červar Porat (Istria, Croatia) – comparison with possible source rocks

Autori
Tibljaš, Darko ; Balen, Dražen ; Vučković, Maja ; Šimić-Kanaet, Zrinka

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Izvornik
Programme & Abstracts / - Edinburgh, 2015, 407-407

Skup
Euroclay 2015

Mjesto i datum
Edinburgh, Ujedinjeno Kraljevstvo, 05.07.2015. - 10.07.2015

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
pietra ollare; chlorite; XRD; Červar Porat; artefacts; provenance

Sažetak
During archaeological excavations performed between 1976 and 1980 at a Roman villa rustica in Červar Porat located close to the town Poreč (Istria peninsula, Croatia), among other Late Antique period fragments (glass, metal, ceramics), fourteen peculiar stone vessel fragments were discovered. They show characteristic tracks of the manufacturing by means of lathe. Vessels made by analogous processes from similar materials have already been found at several localities at Croatian Adriatic coast, but no systematic mineralogical study on this kind of material was performed so far. Two of these vessel fragments were investigated by X-ray powder diffraction and chemical analyses. The only constituent of the first, greenish-grey fragment (inv. no. 7912) is a chlorite group mineral. The mineral composition together with visible schistosity indicated that source material was chlorite-schist, a low–grade metamorphic rock. Such material is one of different lithologies included by Italian term pietra ollare and German Lavez. The other fragment (inv. no. 7907) is dark greenish-grey on the fresh broken surface and brownish on outer and inner vessel surfaces. Distinctive bronze colored flakes can be seen in some parts. In order to determine possible origin of analyzed fragments samples collected on localities in Italian Alps known as ancient production centers of pietra ollare vessels (Valli di Lanzo, Valle d’Aosta, Valchiavenna, and Valmalenco) were also analysed. Comparison of obtained results, which included the literature data for pietra ollare, show that the first artefact has the greatest similarity to some chlorite schists from Val Malenco.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Arheologija

POVEZANOST RADA