Oxidized red fabric; redbrown (PPL), dark brown to dark grey (XP).
Semi-heterogeneous matrix, non-calcareous with no optical activity.
- ca. 35-50%
Inclusions
Quartz (++; cf: -; mono, sr-sa, fine to medium sand; ff: +; mono, poly, sr-sa, (very) fine sand to silt; bimodal), sedimentary rock detritus (+-; possible quartz arenite, ff), chert/flint (+-; ff, weathering, alteration), muscovite mica (+; ff, el), feldspars (-; plagioclase, microcline), O/Fe (+), clay pellets (+-, iron-rich).
The coarse fraction varies from medium to fine sand, the fine fraction from (very) fine sand to silt. Grains are generally subrounded to subangular. Bimodal, most likely natural. Overall the fabric is moderately to poorly sorted, moderately orientated and close spaced.
- ca. 40-50%
Voids
Small planar voids and larger vughs, well aligned parallel to the edge, some infill (resin/epoxy?). Drying cracks associated with iron oxides and clay pellets.
- ca. 10-15%
Diagnostic features
The fabric is characterized by a semi-heterogeneous oxidized matrix with no optical activity and moderate porosity. Dominant quartz inclusions with frequent muscovite mica and opaques/iron oxides, common sedimentary rock detritus, chert/flint, iron-rich clay pellets, and few feldspars. Bimodal (natural). Overall (moderately) poorly sorted fabric consisting of mainly fine inclusions with little matrix.