This group is restricted to ‘Raetian’ mortaria.
The type is orange-brown (2.5YR 6/8–5/8) with a dark red (10R 4/8) or purple-brown (2.5YR 5/4) slip, which is normally restricted to the upper surface of the flange and the internal concavity below the bead. The fabric is hard with an irregular fracture and a rough feel, although smooth where slipped.
This is a well-fired fabric with clay matrix as described above. Inclusions are generally well sorted: quartz (0.1–0.6mm, mostly 0.3–0.5mm) is common, with black iron-rich grains (0.2–0.5mm) and feldspar sparse. Large inclusions, also sparse, comprise red, brown, white and black rock fragments (0.5–1.0mm) and elongate, mica-rich argillaceous grains (c 1.7mm). The trituration grits measure between 1.5–4.0mm, and consist of well-sorted red-brown rocks and quartz, sometimes polycrystalline, although few are extant on our sherd after thin sectioning.
This sample is dominated by well-sorted, frequently rounded inclusions measuring between c 0.2–05mm, occasionally to 1.0mm. Included amongst this size range are common quartz (sometimes polycrystalline) and less flint. Trituration grits consist of subangular rock fragments, predominantly altered fine-grained igneous varieties, up to 3.0mm.