The product is a 31.1 gram crystal made of pure fine silver with a fineness of 0.9999, equivalent to 1 troy ounce of silver. The crystal is lab-grown and purified This unique and rare silver product holds a high level of purity and precious metal content, making it a valuable addition to any collection or investment portfolio. A sample was melted and tested with an XRF with a reading of 0.9999 Ag. Scientifically these are crystals, NOT cement silver. These crystals were grown in a lab setting with high purity standards. As far as the size, I would describe them as granular. Please ask any questions you may have.