Sometimes these are considered pseudofossils but they are manganese oxides - dendritic crystal growth.  This specimen was found in Solnhof...

While at the home and garden supply store picking up concrete materials, this rock was in the landscaping area.  I could not let it get to...

My cousin gave me some pictures of these dendrites. It reminds me of looking down on little trees. He did not tell me if he or his brother...

If you type pseudofossil into the image search engine section of Google, images like the ones shown below will start to appear. These minera...