Mined in the south-western part of Germany, it is said to be excellent for brown slips and glazes.
Sometimes compared to Albany Slip although it has a little less fluxing oxides, higher Al2O3 and a higher iron content (their datasheet claims 3.3% porosity at cone 04 whereas Albany is close to 20%, 8.5% fired shrinkage whereas Albany is around 2.5%).
The analysis provided by Carl-jaeger.de added up to 101 without the LOI, we have scaled it back to 95 to allow for the LOI.
Clay Other Clays that are not kaolins, ball clays or bentonites. For example, stoneware clays are mixtures of all of the above plus quartz, feldspar, mica and other minerals. There are also many clays that have high plasticity like bentonite but are much different mineralogically.