Selenite TV Stone
A selenite TV stone is also known as a fragment of ulexite, this is known as a optical stone as it is able to project a image of a object on the opposite side of the mineral. These stones range in their opaqueness with minimal clarity when a image is being projected.
Ancient Greeks called this crystal Selenite, which means moon. Due to its translucent nature, Selenite was also once used as windows in temples and the homes of nobles because its opaque nature allowed light to shine through and disperse throughout the room.