Selenite Tower - 10” crystalSelenite towers are large structures formed from the mineral gypsum, which is composed of calcium sulfate dihydrate. This type of structure is often found in deserts, near the ocean, and in caves, and is often referred to as a Selenite tower due to its resemblance to a pillar of light. Selenite towers are often used as decorative elements in homes and gardens, and can also be used for spiritual purposes. (#6)