Siderite (twins)       Poudrette Quarry, Mont. St-Hilaire, Quebec, Canada.   Ex. Dr. Steve Chamberlain collection.  Prev. Ward's of Rochester.  A damage-free floater measuring 6.1 x 3.6 x 2 cm overall.  Composed of attractive translucent, light greenish tan twins of tabular siderite with accessories as white coatings (looks to be tabular feldspars and dolomite).  Crystals to 2.8 cm each.  Very nice quality MSH specimen.  $175