Volcano lightning is one of nature's most epic display. That phenomenon is rarely seen and not fully understood by scientists. Generally, lightning forms inside a cloud when mixs warm and cold air. Negatively charge at the bottom and positively charge at the top of clouds are cause of static electrical. A similar thing happens in volcano lightning, but there are some big differences. For example, volcano lightning forms much closer to the groud, doesn't nesessarilly move downwards and, what is most important, it's happens inside plums of ash. Inside towering clouds of volcanic ash, lightning storms can create tiny crystal balls. How does it happend? Volcano split out jugged glass shards during eruptions. Lightning within ash heat the air to 30 000 degrees Celsius, melting the glass particles. This molten droplets then form into balls as they fall through the air. Of course, glass can be made in normal volcanic eruption, but without lightning it doesn't get that unu...
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