The Sight Of The Site

The team reached the location and while they look around one of the team members stumbled upon a massive streak of the volcanic rock kimberlite. It was then they discovered a big, alien-like stone which nobody has ever seen in their whole life. The three geologists just hit a jackpot as the area was full of rich mineral deposits. They knew that they have found a way to revive the country. But their worst nightmare was about to come in front of them that would change their and country’s destiny forever. What natural event happened that day of which the geologists had no idea about?