This Rookwood Faience tile measures 4" square and it is about 1/2" thick.  It is glazed in matte green and finished to a satin matte.  It is marked Rookwood Faience on the backside.  This tile is in very good condition with a couple of minute edge nicks, shown in the photos.

Rookwood Faience 4" Tile in Matte Green Glaze c1920