1. The quality of resembling clay, i.e. in thickness or consistency
   "And it uses clay (well, something Play Doh-like in its clayiness).";
   - clayeyness, clayishness
    
2. The quality of being composed of clay
   "During periods of excess moisture, grazing needs to be restricted in many places because of the clayiness of the surface soil";
   - clayeyness, clayishness

Type of: body, consistence, consistency, substance