A fascinating natural Moroccan pseudo-stromatolite sand concretion, weighing approximately 30–40g each.
Commonly known within the mineral and fossil trade as a “Sand Stromatolite” or “Desert Onion”, these unusual Saharan formations are more accurately regarded as natural sandstone concretions rather than true fossil stromatolites.
Each specimen is completely unique, with naturally formed concentric rings, raised centres and layered patterns creating striking circular and oval designs across the surface.
The pieces display warm terracotta, reddish-brown and sandy orange tones with a naturally rough, granular texture.
Details:
- Moroccan pseudo-stromatolite / sand concretion
- Common trade name: Sand Stromatolite / Desert Onion
- Natural, unpolished specimen
- Approximate weight: 30–40g each
- Concentric ring and layered formations
- Warm terracotta / sandy orange colouring
- Origin: Morocco
- One specimen supplied
Please note
This is a random selection listing, so the exact shape, colouring and pattern of the specimen received will vary.
If there is a particular specimen shown in the photographs that you especially like, please contact us before ordering and we will be happy to check whether it is still available.
As these are completely natural geological formations, variations in shape, colour, surface texture, small fissures, loose grains and natural weathering are to be expected.