It is one of the very few minerals that crystallize in the Orthorhombic Disphenoidal Class . This symmetry class has just three 2 fold rotational axes at right angles to each other. No mirror planes or other symmetry operations. It is unfortunate that epsomite does not typically form well shaped crystals that show the unusual symmetry. Color is colorless, white with pale shades of pink and green.
Crystals are translucent to transparent.
Crystal Habits include fibrous, acicular, encrusting, stalactitic, botryoidal and granular masses. Typically formed on the walls of caves and mines as efflorescences and in playa lakes. Cleavage is perfect in one direction and distinct in two other directions. Fracture is conchoidal. Streak is white to colorless.