Kambaba Jasper, is a green rhyolitic volcanic stone found in the Bongolava region of Madagascar. The name Kambaba comes from a river close to where the stone is mined. The black orbs in the stone resemble crocodile eyes, giving it the nickname Crocodile Jasper. These blackish, irregular shapes closely resemble some types of stromatolite fossils. In fact, many people have claimed that Kambaba Jasper is a stromatolite. However, thin-film and X-ray diffraction analysis done by the EPI-Lab (Institut Für Edelstein Prüfung, The German gemstone testing institute) shows that Kambaba Jasper is a rhyolite of volcanic origin and thus can not be considered a stromatolite. They concluded that it is composed of a green quartz, pyroxene (Aegirine), as well as soda and potash spats, circular aggregates are arranged from very small amphibole needles.