A cool and unusual rock, need some help with identification

[AdiBhos]

Found this near a dried river bed, this one was a bit unexpected as the area has many crystalline rocks. The pattern on it is unlike any other thing I’ve ever see on a rock. The rock seems to be another example how creative nature can be.
The rock has similar pattern on its backside

 

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[DDancer]

Its a very nice agate. Its not uncommon to find agate amongst primarily crystal hunting areas. And yes, nature can be quite creative.