Selenite crystals are a form of the mineral gypsum, known for their translucent, glassy appearance. They are typically colorless or white, but can also be found in shades of orange, yellow, and green. Selenite is often used in decorative items, such as lamps and sculptures, due to its unique beauty and ability to reflect light. These crystals are named after the Greek word for moon, "selene," because of their luminous quality. Selenite is also believed to have metaphysical properties, often associated with clarity, purification, and spiritual growth. However, it is important to note that these claims are not scientifically proven.