Celestine is usually found as colorless, milky white, yellow, orange, or pale blue prismatic crystals, or in fine-grained masses. With a hardness of only 3 on Moths' scale and perfect cleavage, Celestine is extremely fragile. It has been cut for the collector, however, and some-line specimens can he seen in museums.

Celestine may occur with sandstones or limestone's, in evaporate deposits, in pegmatite's, in cavities in volcanic rocks, or with galena and sphalerite in mineral veins. Most of the material that is capable of being faceted is found in either Namibia or Madagascar. It is also round in Italy (including Sicily), England (Czechoslovakia, the USA, and Canada.

The name "Cassiterite" comes from the Greek word. Kassiteros, meaning tin.