The world-class geological heritage and only found on Belitong Island is Billitonite or locally known as Satam. This rock come from a space meteor that hit a fresh atmosphere about 700 thousand years ago. This meteor is part of Australasian Strewn Field which is spread in Indochina, Indian Ocean, Andaman Sea and Australia. The location of the distribution of these meteors covers 18 percent of the earth’s area (McCall, 2005). Billitonite is classified as stratified / layered tektites type which after crashing into the atmosphere then directly scattered and fell to the earth (Bunopas et al, 1999).
Billitonite is unique in its form and mineral content. The form of billitonite is characterized by luster black colour, a shape rounded, and deep furrow. The chemical content of NiO2 billitonite is the richest in the world and the highest density of Australasian Strewn Field (Burkser et al, 1960). The geological heritage and its relation to the history of tin mining in Belitong can be found at Geosite Garumedang.