sedimentary
Fossilized Plant or Tree Bark
Lepidodendron or Sigillaria (example genera)
Hardness: 3-4 (matrix usually shale or siltstone), Color: Grey to dark charcoal, Luster: Dull/Earthy, Crystal Structure: Amorphous/Organic, Texture: Imprinted or carbonized surface.
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Physical properties
Hardness: 3-4 (matrix usually shale or siltstone), Color: Grey to dark charcoal, Luster: Dull/Earthy, Crystal Structure: Amorphous/Organic, Texture: Imprinted or carbonized surface.
Formation & geological history
Formed during the Carboniferous period (approx. 300-360 million years ago) in swampy forest environments through rapid burial in anaerobic conditions.
Uses & applications
Paleontological study, educational tools, and private geological collections.
Geological facts
These giant lycopsids grew up to 30 meters tall and are major components of the coal seams found across the Northern Hemisphere.
Field identification & locations
Identified by symmetrical patterns or scale-like impressions on flat sedimentary layers. Common in coal-mining regions like the Appalachians or the UK.
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