Thank you for viewing. This is an alum crystal. It was made by immersing it in a saturated alum solution without suspending it with a thread, washing it once a day with distilled water, and changing its orientation. This is the "lying down" method. Size: Approximately 60 millimeters per side Weight: Approximately 174 grams Please feel free to ask any questions in the comments. Please understand that this is a handmade item and may have chips or scratches before purchasing. It will be shipped via Yu-Packet Plus. #alum #crystal