A 23+g sample of Calcium metal in the form of a beautiful and stunning distilled crystal cluster. Please note that there are a few small loose crystals inside dome but this does not detract from the samples appearance. This museum grade sample was produced by distillation of the metal and slow cooling of the vapor to grow the beautiful crystals you see here. The sample is sealed in a quartz dome under Argon to permanently preserve the shiny surface. Purity is 99.99%. This is a truly unique and one of a kind piece! Pictures just don't do it justice.