Emerald Calcite displays a spectacular blue-green to sea foam coloration. So beautiful is this variety of Calcite, it has been given the name Emerald Calcite rather than just green calcite. Although Emerald Calcite is striking to look at, it is still a form of calcite which makes it too soft to cut for use in Jewelry applications. Calcite is a very common mineral and is a main component in chalk, limestone, and marble. Other forms of Calcite include Blue Calcite, Honey Calcite, and Orange Calcite.