📜 Key facts
| Age | Precambrian stromatolites, often quoted around 1–3 billion years |
|---|---|
| Origin & sources | Madagascar and South Africa. |
| Composition | Fossil algal mats (stromatolites) in chert or jasper with green and black orb patterns |
How it forms
Mats of cyanobacteria trapped sediment in layers. Silica later permineralized them, preserving some of the oldest evidence of life on Earth.
Mineral data: see Jasper.
🌍 Where it's found
- Type locality
- Notable source / deposit
- Country of origin
Marker positions are approximate (region or locality level). Type localities from Wikidata; notable sources curated by Crystopedia.
Learn more
Rock
Green
RootHeart
Healing crystal

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