Lighting Strike Fulgrite - Fused Sand into Glass
Location - Polk County, Florida
Size Riker - 5 1/4" X 4 1/4" Specimen Size - 2 3/8" (7.8 Grams)

Fulgurites are natural tubes, clumps, or masses of sintered, vitrified, and/or fused soil, sand, rock, organic debris and other sediments that can form when lightning discharges into ground.