sedimentary
Stromatolite
Biogenic sedimentary rock
AI-generated identification · may be incorrectHardness of 3 to 4 on the Mohs scale. Displays distinct banded or layered textures in earth tones like brown, green, and black, with a dull to waxy luster.
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Physical properties
Hardness of 3 to 4 on the Mohs scale. Displays distinct banded or layered textures in earth tones like brown, green, and black, with a dull to waxy luster.
Formation & geological history
Formed through the trapping, binding, and cementation of sedimentary grains by micro-organisms, primarily cyanobacteria, in shallow aquatic environments over billions of years.
Uses & applications
Used primarily as a decorative stone, in lapidary arts, and as highly valued specimens for fossil and mineral collectors.
Geological facts
Stromatolites represent some of the oldest records of life on Earth, dating back over 3.5 billion years, and played a crucial role in oxygenating Earth's early atmosphere.
Field identification & locations
Easily identified by its distinctive internal laminated growth structures and micro-layered patterns. Common locations include Australia, Bolivia, and the United States.
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