Selenite, a crystalline form of gypsum, is renowned for its translucent, pearly sheen and fine, fibrous striations that lend it an ethereal appearance, almost as if it's imbued with the moon's glow. This mineral is named after Selene, the Greek goddess of the moon, reflecting its moon-like radiance. Selenite crystals commonly exhibit a columnar or tabular form, and they can be found in large, transparent sheets or smaller, wand-like shapes.