This Kambaba Jasper tower weighs 13oz and measures approximately 2x1.25x5.5”

Kambaba Jasper is actually a combination of microcrystalline Quartz, Feldspar, Cristobalite, and Albite. And interlacing those minerals are Stromatolites which, in fact, are not rocks at all but rather the fossilized remains of ancient cyanobacteria and other primordial microorganisms! Cyanobacteria is a blue-green alga that happens to be some of the oldest known fossils. The cyanobacteria aren’t just your average algae. It’s thought to have created some of the first traces of oxygen on our planet! [source: Crystal Viden]

This specimen is from Madagascar.