What cause electrical storms to form above volcanoes?

What cause electrical storms to form above volcanoes?
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Answer :

I had heard that it was caused by static build-up from the friction of ash particles. Edit: Just found these three hypotheses: A. the interactions between ash particles causing a static buildup B. ash acting as condensation nucleii for magmatic water which then accretes as ice via riming. Charging then occurs as in a thunderstorm C. a piezoelectrical source due to the fracture of crystals upon eruption source
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