Lightning Strikes - Rio de Janeiro, Brazil - 2014 - Antonio Lacerda photography / EPA - http://www.nydailynews.com/news/world/incredible-photos-show-lightning-strike-christ-redeemer-statute-rio-de-janeiro-article-1.1583494
"This is What Happens When Sand Gets Struck by Lightning: Fulgurites are natural hollow glass tubes formed in quartzose sand, silica, or soil by lightning strikes (at 3,270 °F), which instantaneously melts silica on a conductive surface and fuses grains together over a period of around one second. Photographed by Ken Smith."
When Lightning Strikes Sand. Fulgurites (Latin, meaning "thunderbolt") Sometimes referred to as petrified lightning, they are natural hollow glass tubes formed by lightning strikes in quartzose sand, silica, or soil. (Wikipedpia)