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Saturday, December 18, 2010

Dendrites - Plant Pseudofossil?

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 torn up so I saved it from becoming part of a walkway.  Not sure where it came from or exactly what it is. The rock is in layers in a pinkish-red color with dendrite patterns through out.  On one edge is a collection of small crystals.  If the rock could be split it appears more layers have the dendrite pattern.




2 comments:

  1. The rock looks like a shale; the reddish color is probably due to Fe₂O₃. Dendrites form from MgO and are often mistakenly identified as the mineral pyrolusite. Nice piece to add to your mineral collection.

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  2. Thanks for the identification.

    The slab is somewhat larger than I am use to collecting and storing though.

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