XLarge Que-Sera Tumbled Stone Que-Sera Tumbled Stone. Gorgous stone held together by quartz, but pieced together with plagioclase, sericite, chloritized rock fragments, potassium feldspar, calcite, kaolinite, iron-oxides, magnetite, clinozoisite, and leucozene. It comes with a certificate of authenticity. Please note that you are buying a single stone. The photo shows typical ones. All are different. You will be pleased... we guarantee it. Que-Sera is a used for bringing the Universal Life Force energy to bear on a complex and difficult problem. Que-Sera is a meditation crystal that should be kept for very special occasions. It is rare and valuable because of it's highly active energies. XLarge, 1 - 1 1/2 inch, sold individually.