Calcite on Fluorite   Naica, Chiuahua, Mexico.  Ex. Dr. Steve Chamberlain collection.  Great piece, damage-free, attractive form and texture combination.  The cluster sits on edge and measures 6.1 x 5 x 4.2 cm.  Wonderful combination that is aesthetically stacked.  Views nicely from all sides.  A fine older (1984) piece.  $75