clayey

from WordNet (r) 3.0 (2006)

clayey
    adj 1: resembling or containing clay; "argillaceous rocks" [syn:
           {argillaceous}, {clayey}] [ant: {arenaceous}, {sandlike},
           {sandy}]
    2: (used of soil) compact and fine-grained; "the clayey soil was
       heavy and easily saturated" [syn: {clayey}, {cloggy},
       {heavy}]

from The Collaborative International Dictionary of English v.0.48

Clayey \Clay"ey\, a.
   Consisting of clay; abounding with clay; partaking of clay;
   like clay.
   [1913 Webster]