English Calcites are among the most highly-sought after and well known of any Calcite specimens around. The classic "heart-shape" and "butterfly" twins are known throughout the world for their classic form. This lovely thumbnail consists of one sharp and gemmy twin that is simply excellent. It sits atop a cluster of fine, modified Calcite scalenohedrons, and the orange fluorescence is really captivating. A choice thumbnail from a famous locality.