The fabric is characterized by a matrix dark to opaque in crossed polarized light and dark brown in regular polarized light. Particles are usually double-spaced and voids are 10–20%. This is probably a non-calcareous clay. the coarse:fine:voids20μm ratio (c:f:v) is 30–45:30–60:10–25. Several examples were probably fired in a temperatures 900 degrees or higher.
Non-plastics include mainly limestone, travertine and calcareous concentrations, together about 20% of slide area (chalk, limestone, travertine; usually up to 0.5 mm fragments), opaque minerals, quartz (5–20%, silty or bimodal, see below), shale (up to 5%, usually rounded up to 0.8 mm, occasionally up to 1.8 mm) and pellets. In several examples rounded oolitic limestone appears (a...