Witherite on Calcite    Mahoning #1 Mine, Cave-In-Rock, Illinois.  Ex. Dr. Steve Chamberlain Collection #6263.  Prev. Neal and Chris Pfaff.  This outstanding small cabinet specimen is composed of single terminated witherite crystals which are white in color, have a medium luster and are very translucent.  The grouping is approximately 10 pseudohexagonal twinned crystals which are in parallel growth on a small section of calcite matrix.  The calcite crystals protruding from this matrix are a very light yellow color and very thin and tapered.  This piece fluoresces a reddish white in S.W.  U.V. and has a very strong phosphoresce, as well.  The witherites are up to 2.8 cm each and the calcites up to 2 cm.  The dimensions are 5.3 x 4.1 x 3.9 cm.  There are a couple tiny rubs on the witherite.  A fine specimen which is more displayable than most.  This specimen is an outstanding example of this rare carbonate mineral from Cave-In-Rock, IL.  A very displayable and desirable specimen in all regards.  295$