The Que Sera Skull measures approx. 61 x 92 mm: thickness 32 mm: weight 577 grams.
 
Que Sera, also known as Llanite or Vulcanite. This is a form of Rhyolite, it is comprised of variety of stones, the blue is Quartz crystals, and the pink/white is feldspar. This stone can only be found in the Llano Uplift in Llano County, Texas. Que Sera can be found in a grey matrix variety and that stone comes from Brazil. The hardness is a 7.