Rare specimens of the mineral fulgurite.These are the lighter singing type that have a distinctive ring to them when hung up and struck created when lightning hits dry sand fusing it into these specimens.Great educational and hands on learning specimens of RARE all natural lightning fused sand,known as fulgurite,from the Sahara desert in northern Africa.Each winner will receive 1 ounce containing 15 plus pieces of fulgurite,sized approximately 1/2 to 1 1/2 inch long by 1/4 to 3/4 inch wide,scooped from fulgurite as pictured.