Satin Spar (Satin Spar Gypsum)

Mohs hardness of 2 (can be scratched with a fingernail), fibrous crystal structure with a silky or pearly luster, translucent to white color, perfect cleavage in one direction.

Formed as an evaporite mineral in saline lakes, playas, and shallow seas where seawater rich in calcium and sulfate evaporated.

Popular in metaphysics and crystal healing as a cleansing stone, used for decorative carvings, lamps, polished sticks/wands, and in construction as plaster of Paris or drywall.

Satin spar is often commercially labeled and sold as 'Selenite', although true selenite forms clear, flat, sheet-like crystals, while satin spar consists of parallel fibrous aggregates that produce a cat's-eye (chatoyant) effect.

Identified by its extreme softness (easily scratched by a fingernail), silky sheen, and fibrous parallel structure. Commonly found in Morocco, Mexico, USA, and Poland.