Crystal or wood?

[BridgetownTreasures]

This light blonde piece (approx 6” square) LOOKS like wood grain, but has the partially translucent look of agate or crystal also. Any thoughts? Origin is eastern Oregon but I’m afraid that’s as specific as I can be...

 

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[Clay Diggins]

Nice piece.

It's commonly called Onyx although it's not a true Onyx which is a variety of Chalcedony. It's probably limestone Onyx which is a variety of banded Calcite also commonly called Mexican Onyx or Honey Onyx. The "sugary" breakage is typical of calcite Onyx.

You can test it pretty easily. If it's Calcite it's soft enough to mark with a pocketknife and will bubble when exposed to acids. True Chalcedony Onyx does neither.

 

[BridgetownTreasures]

Looks like calcite. Marks with a sharp pocketknife. [emoji106]🏻