quartz (mono- and polycrystalline), minor amounts of intensely weathered feldspar; coarse dolomite cement with at locations also silica cement; high intergranular porosity
Texture
coarse grain size, well sorted, subangular to rounded grains
Graue B., Siegesmund S. & Middendorf B. 2011. Quality assessment of replacement stones for the Cologne Cathedral: mineralogical and petrophysical requirements. Environmental Earth Sciences 63: 1799-1822.