CALCAREOUS TUFA : NORTH WRAXALL, WILTSHIRE, ENGLAND 25g MF5506

SPECIMEN : CALCAREOUS TUFA [ LABELLED AS TUFF] WEIGHT : 25g SIZE : 40 x 30mm PROVENANCE : NORTH WRAXALL, WILTSHIRE, ENGLAND WITH MINERAL COLLECTION IDENTIFICATION DOCKET MF5506 NOTE : The collection from which this piece came from indexed and labelled as "Tuff". Tuff normally refers to pyroclastic origin [volcanic]. However the term is also used for porous calcareous rocks - usually labelled as "Tufa". This piece comes from a location where the stone was used for building in Roman times.