These are real Moroccan stromatolites! They would make for wonderful display items or gifts! 

Stromatolites are natural layers formed by photosynthetic cyanobacteria (also known as blue-green algae). 

Though they have become rare in the modern era, the fossil record shows that they were far more abundant in the past - especially in the Precambrian.

Worldwide shipping is available and they measure ~1.5-2" long.

PRICE IS PER RANDOMLY-SELECTED SPECIMEN. This photo represents the range the buyer will receive.