"Fused lightning" or fulgurites, larger
Fulgurites, or "fused lightning" from the Sahara Desert, North Africa. When lightning strikes sand, such as on a beach or in the desert, the immense energy goes into the ground, fusing the sand along its path into sand encrusted rudimentary glass, often as thin walled tubes. You can easily see the tube form of the centre specimen in the first photo. Mounted onn silver coloured posts.
Left: 7/16 inch (1.1 cm) wide, 3/8 inch (0.95 cm) deep, 1 1/8 inches (2.9 cm) tall.
Centre: 1/2 inch (1.3 cm) wide, 1/2 inch (1.3 cm) deep, 1 5/16 inches (3.3 cm) tall.