Polyliothinite       De-Mix Quarry, Mt. St-Hilaire, Québec, Canada.  Ex. Dr. Steve Chamberlain collection.  I've owned many of these through the years.  This one is hands-down the finest thumbnail I've had or seen.  It is a floater ball measuring 3.5 x 2.7 x 2.5 cm.  It is composed of large bladed crystals with smaller (more white colored) second generation crystal within the deeper voids between them.  It is damage-free and shows outstanding views from any direction, even bottom or back.  Exceptional in every regard.    $495 on sale at $396