rockon-ro: FULGURITE from Morocco. A fulgurite is a hollow, tubular piece of fused sand caused by a
rockon-ro:FULGURITE from Morocco. A fulgurite is a hollow, tubular piece of fused sand caused by a lighting strike to the ground. They are hollow and lined with melted sand grains and generally less than an inch or two in diameter ( a lighting bolt is normally 1 to 2 inches in diameter). Fulgurites mark the pathway the lighting followed into the ground. -- source link
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