It is green orbicular rock from the South Africa Rift on the west side of the island of Madagascar.
This stone is also sold under the names Kambaba Jasper, Kambamba Jasper, and Crocodile Jasper or Crocodile Rock.
Kabamba Jasper is actually a volcanic Rhyolite rock with black orbs or rounded aggregates that consist of needles of amphiboles.
Though previously marketed as a stromatolite, experts now say it is not.
Kabamba Jasper cabochon stones are said to be deeply soothing to the mind and the nervous system.