Philippinite

They are considered to be about 710,000 years old on the average[1] and generally ranging in size from millimeters to centimeters.

[1] In 1964, a very large philippinite, weighing 226.3 grams (0.499 pounds) with dimensions 6.5 x 6.2 x 5.2 cm, was purchased by the University of California, Los Angeles Department of Astronomy.

[5] The term rizalite was named after the Philippine province of Rizal where the first black tektites were rediscovered in October 1926 at Novaliches (which was then part of Rizal).

[3] Although, it was only in 1928 that the term was proposed by American anthropologist H. Otley Beyer, dubbed as the father of Philippine tektite studies, to refer to tektites found in the Philippines.

[6] Philippinite has become the more favored term because other tektites were found in other areas of the Philippines such as the Bicol region and the town of Anda in the province of Pangasinan.