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.
- http://www.nationalmuseum.gov.ph/nationalmuseumbeta/Collections/Geology/Tektites.html Rizalites on National Museum of the Philippines
|This Philippines-related article is a stub. You can help Wikipedia by expanding it.|
|This article about a specific mineral or mineraloid is a stub. You can help Wikipedia by expanding it.|