Calcite - Elmwood Mine, Tennessee, USA
 
 The Elmwood Mine near Carthage in the US state of Tennessee is one of those sites that collectors immediately associate with a certain mineral type. In this case Scalenohedral-Twin-Calcite with the unmistakable gold-cognac-colored appearance. This 9.2 cm x 5.4 cm crystal shows the characteristic features of this world-famous site.