Leucite     Civita Castellana, Rome, Italy.  Ex. Dr. Steve Chamberlain Collection.  This is one of the nicer examples of this material that I have had…it is 2.9 cm cluster of crystals with the addition of several nice black crystals (sorry, I’m just not sure what these are).  The thin crack down the center appears to be natural and not a repair.  Damage free floater.  Really nice.  55$