NDLI: Representative archaeological finds of pietra ollare from Comacchio (Italy): identifying provenance and high-T mineral breakdown reactions hindering lithotype classification

Content Provider	Springer Nature Link
Author	Mini, Francesco M. Santi, Patrizia Renzulli, Alberto Riccardi, Maria P. Antonelli, Fabrizio Alberti, Antonio
Copyright Year	2014
Abstract	Three different lithotype groups have been recognized in representative fragments of pietra ollare artefacts found in the mediaeval archaeological excavations of Comacchio (Italy). Petrographic, mineralogical and chemical compositions clearly show that Valchiavenna and Valmalenco, in the Central Alps, represent the provenance areas of two of the pietra ollare groups, i.e. grey carbonate talc schist (also known as soapstone) and green chlorite schist, respectively. The third representative pietra ollare group consists of whitish-yellowish rocks inferred to be Alpine talc schists that have suffered some artificial pyrometamorphic transformation hindering their classification in the framework of pietra ollare lithotype categories and source localities reported in literature. A distinguishing feature of these high temperature-fired (HT-fired) talc schist samples is the occurrence of talc and chlorite dehydroxylation and subsolidus reaction products, mainly protoenstatite/enstatite + forsterite, together with relatively low loss on ignition values. These talc schists might have been exposed to temperatures >900 °C (with the resulting talc dehydroxylation producing a void-rich texture), but never reaching 1200 °C, which is the sintering temperature for soapstones. The whitish-yellowish artefacts were definitely not used as containers for cooking food at temperatures below or around 500–600 °C (as instead shown by the preservation of the original physical features of the grey pietra ollare lithotypes), but in some kind of higher-T pyrotechnological processes.
Starting Page	135
Ending Page	148
Page Count	14
File Format	PDF
ISSN	18669557
Journal	Archaeological and Anthropological Sciences
Volume Number	8
Issue Number	1
e-ISSN	18669565
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-12-06
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pietra ollare Soapstone Talc dehydroxylation Chlorite breakdown Magnesite decarbonation Earth Sciences Archaeology Chemistry/Food Science Geography Life Sciences Anthropology
Content Type	Text
Resource Type	Article
Subject	Archeology Archeology (arts and humanities) Anthropology

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