This beautifully patterned palm stone is Stromatolite. 
This material is formed by ancient cyanobacteria, some of the earliest life forms on Earth. These layers that you see have been developed over billions of years as microorganisms trapped within sediment, slowly building up the patterns you see today.
A talking piece for your collection and metaphysically referred to as a very grounding stone that is said to usher in growth with a sense of ancient wisdom.
Definitely a favourite of ours! We believe it is a very special piece that you can add to your collection.
APPROX SIZE - 7cm x 6cm x 2.5cm