Sphalerite and Calcite    Joplin, Missouri. Ex. Paul and Dawne Dunning collection. 6 x 4 x 2.1 cm specimen with several large sphalerites to 2.2 cm each. Matrix is dolomite. Two transparent calcites can be seen too. Minimal contact on one end of specimen only, all other sides crystallized. Nice satin luster and no damage. $75