Kabamba rock or Eldarite, A Rhyolyte spherulitic volcanic rock from Bongollava, Madagascar. Also knows as Kabamba Jasper. It is often thought that this is a stromatolite, but the mineral composition proofs its volcanic origin.
On average between 20 and 30 pieces. You will recieve 1 KG similar to the ones on the photo. Unsorted, mixed quality.