The Collaborative International Dictionary of English v.0.48:

blebbed \blebbed\ adj.
   marred by small bubbles or small particles of foreign
   material; -- of glass or quartzite.

   Syn: blebby.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

blebbed
    adj 1: (of glass or quartzite) marred by small bubbles or small
           particles of foreign material [syn: blebbed, blebby]