Crocodile Jasper
Silicon dioxide (SiO2) with iron-rich stromatolitic structures
A deep green-and-black stromatolitic jasper, essentially Kambaba Jasper, with circular eye patterns resembling crocodile skin.
- Mohs hardness
- 6.5-7
- Color
- Deep green and black with circular 'eye' patterns
- Type
- mineral
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Overview
Crocodile Jasper is a trade name closely tied to Kambaba Jasper, describing a deep green-and-black stone marked with circular, eye-like patterns and swirls that resemble crocodile or reptile skin. The names Crocodile Jasper, Kambaba Jasper, and Crocodile Rock are largely synonymous in the trade.
It is famous for being stromatolitic, containing the fossilized remains of some of Earth's earliest life: layered microbial colonies preserved in silica. This gives it both a striking look and genuine geological significance.
The stone is opaque, takes a rich polish, and is prized for its dark green color and organic patterning.
Formation & geology
Crocodile (Kambaba) Jasper formed from ancient stromatolites, dome-shaped structures built up over time by photosynthesizing cyanobacteria in shallow Precambrian waters. As silica and iron-rich minerals replaced and cemented these microbial mounds, the concentric layers were fossilized into the circular "eyes" and swirls visible today.
The deep green color comes from minerals such as iron-rich silicates, with black from additional oxides. The classic material is sourced from Madagascar and parts of southern Africa, where these ancient deposits are exposed.
How to identify it
Look for a dark green-to-black opaque stone with distinctive circular or oval "eye" patterns and wavy banding. Hardness is 6.5-7, scratching glass; streak is white to greenish-grey; polished luster is glassy.
The rounded stromatolite eyes are the key identifier, separating it from plain green jaspers and from speckled stones. It is essentially the same as Kambaba Jasper. Full opacity and high hardness distinguish it from agate and soft dyed imitations.
Uses & significance
Crocodile Jasper is cut into cabochons, beads, spheres, palm stones, and carvings that highlight its dramatic eyed patterning. It is popular in earthy and statement jewelry as well as decorative objects.
Metaphysically it is marketed as a deeply grounding, calming "stone of peace" connected to ancient earth energy, fitting given its fossil origin. Its real value lies in its beauty, durability, and status as one of Earth's oldest fossil-bearing stones.
Frequently asked questions
Is Crocodile Jasper the same as Kambaba Jasper?
Yes, essentially. The two trade names describe the same green-and-black stromatolitic jasper with eye-like patterns.
Are the patterns in Crocodile Jasper fossils?
Yes. They are fossilized stromatolites, formed by ancient colonies of cyanobacteria preserved in silica.
Where is Crocodile Jasper found?
Mainly Madagascar and parts of southern Africa, where ancient stromatolite deposits are exposed.
Why is it called Crocodile Jasper?
Its deep green color and circular, scale-like eye patterns resemble crocodile skin.
Crocodile Jasper guides
In-depth guides for identifying, valuing, and understanding Crocodile Jasper.
Crocodile Jasper identified by the community
Real specimens identified with Rock Identifier.
