A tube of glassy rock formed when lightning strikes sand or soil, fusing the grains together; literally fossilized lightning.
From Latin 'fulgur' (lightning). When lightning hits sand at 30,000°C, it creates these hollow glass tubes — nature's own sculpture. Some are found several meters long.
FOSSILIZED LIGHTNING! When lightning hits sand, it's SO hot it turns the sand into GLASS tubes! You can hold actual lightning in your hand! They're Nature's most dramatic art installation! âš¡ðŸ–ï¸
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