Sampled in the context of research Prof. Dr. Veerle Cnudde.
Natural color
dark grey
Aged color
light grey
Components
white bioclasts (mainly crinoids) and carbonate intraclasts in a dark grey matrix
Texture
Structure
Weathering
light grey patina as the result of oxidation of organic material; frost sensitive when high clay fraction (vague plate-like cleavage); scratch sensitive