Cost is for one (1) piece. No two pieces are alike. While we carry size L each one will slightly vary in size, shape and colour. \n \nCrack open these real geodes to discover how stones are formed! Kids of all ages will love the surprise of beautiful crystals hiding inside an unassuming rock. \n \nThese small hollow geodes are composed of various forms of quartz. The inner core is commonly the crystaline variety, while the outer skin is made up of microcrystaline quartz or agate. They are formed from volcanic gas balls which cooled and formed hard outter coatings. The inside is mostly hollow with many crystals that formed when the minerals and gases cooled. \n \nQuartz is one of the most well-known and abundant minerals on earth. It occurs basically in all mineral environments and is an important constituent of many other minerals. Even though quartz makes up a third of the earths crust, there are only ten regions where top quality crystals justify extraction. In antiquity it was thought to be solidified light. \n \n  Our supplier is a Canadian company based out of BC. They are committed to ethically sourcing their stock and only work with those who have appropriate mining certificates which establish their operations as safe and environmentally sound.