fossil
Stromatolite fossil in Chert/Jasper
Cyanobacteria / Microcystis (fossilized)
Hardness: 6.5-7 (Mohs); Color: Tan, yellow-brown, ochre; Luster: Dull to waxy; Structure: Finely laminated, rhythmic wavy bands or domes; Cleavage: None
- Hardness
- 6
- Color
- Tan, yellow-brown, ochre
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Tan, yellow-brown, ochre; Luster: Dull to waxy; Structure: Finely laminated, rhythmic wavy bands or domes; Cleavage: None
Formation & geological history
Formed by the trapping, binding, and cementation of sedimentary grains by biofilms of microorganisms, specifically cyanobacteria. These represent some of the earliest life forms on Earth, often dating from 500 million to over 3 billion years old.
Uses & applications
Scientific study of early life, lapidary use for jewelry (when highly silicified), and popular as educational fossils for collectors.
Geological facts
Stromatolites are 'living rocks'; while most are ancient fossils, they still grow today in places like Shark Bay, Australia. They were responsible for the 'Great Oxidation Event' by creating Earth's breathable atmosphere.
Field identification & locations
Identified by unique concentric or wavy lamination patterns that do not match standard geological folding. Found in ancient sedimentary basins worldwide, particularly in the Gunflint Chert (USA/Canada) and Pilbara (Australia).
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