闪电熔岩(英语:fulgurite),又译作雷击石,是天然造成的玻璃长管。当闪电击中泥土或沙,就可能令它们瞬间融化,然后又凝固,便会形成天然的石英玻璃。形状多是长条状,和闪电的路径相近。
闪电熔岩长可达数米。颜色由形成的泥土和沙决定,有黑色、绿色、白色等。内部光滑,可能有小气泡,外部多数为粗糙的沙粒。它们外形像树根。
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