What is "rizalite"

Rizalites are black stones of meteoritic origin found in the Philippines. They are considered to be some 710,000 years old.

As such, they are considered tektites - bodies composed of black or dark brown natural glass formed from terrestrial debris ejected during extraterrestrial, meteorite impacts. They generally range in size from millimeters to centimeters.

The stones were named by the Philippine national hero José Rizal.