Sphalerite on Calcite Zinc Corp. of America Mine, Talcville, New York. Tiny bright yellow, gem sphalerite crystals are scattered about on the front and back of this piece. It measures 7.2 x 5.5 x 3.2 cm overall and has crystals of sphalerite to .6 cm each. Contact along one edge and a couple small areas that were contacts or are minor scuffs. Generally it is in very good shape with fine gemmy yellow crystals that stand out well. A very nice price….95$