Fossil wood?

[fgiarro]

I have this specimen sold as fossil wood (without other info)  in my collection. The shape and circularity of the visible rings of crystals could confirm this, but actually I'm not sure about it- I'd like to hear the opinion of some experts. Thanks in advance.

 

 

[Fossildude19]

Looks like pet wood to me.

Not sure you can say much more about it.

[Rockwood]

It looks to be in the spectrum of the way wood becomes mineralized. Was there information about the source ? Wood is usually common where it is found, and the context often becomes the best identifier. 

[DPS Ammonite]

It really looks like calcite; probably a spring or cave deposit. Could be section of a stalagmite/stalagtite. See if it fizzes in acid. Note non wood like wavy banding that goes from thick to thin in a short distance.

[Mark Kmiecik]

Tree rings are continuous -- don't end or divide. My vote is for geologic specimen.

[fgiarro]

1 hour ago, DPS Ammonite said:

It really looks like calcite; probably a spring or cave deposit. Could be section of a stalagmite/stalagtite. See if it fizzes in acid. Note non wood like wavy banding that goes from thick to thin in a short distance.

In fact I had thought of calcite as well, the color would correspond - I only had 10% acetic acid at home, I passed it on the plate and the effervescence is barely perceptible; anyway I hadn't thought that it could be a section of stalactite, and now I suppose that one is the exact identification - Thanks, Fabio

[Coco]

Hi,

 

I suppose if it is of this nature it is more of a stalagmite, because the stalactite has a hole in the middle to let the water flow.

 

Coco

[Rockwood]

1 hour ago, Coco said:

Hi,

 

I suppose if it is of this nature it is more of a stalagmite, because the stalactite has a hole in the middle to let the water flow.

 

Coco

Trees also have a hole of sorts in the center. The pith cavity. The rings in a mineral replaced trunk need not, in fact often don't represent the actual rings. Rather they represent mineral that precipitate in the cavity left by the decaying wood. In that case I believe it is called a wood cast, however. In my opinion, the context should be taken into consideration. 

[MarcoSr]

Looks geologic to me.  Below are some cave mineral examples (entire piece and closeup pictures) from my collection.

 

Kokoweef Cave Onyx, Cave Popcorn, calcite aragonite stalactite freeform, Jurassic Period 155 mya, Kokoweef Cavern Ivanpah Mountains San Bernadino Co California, (163 grams 77x51x38mm):

 

 

 

 

 

Stalactite, Mexico (982 grams 7x5x.875 inches)

 

 

 

 

 

Stalagmite, Speleothem Complex Biogenic Travertine Karst Deposit, Tertiary, Superstition Mountains near Apache Junction Arizona (156 grams 4x2.5x.375 inches):

 

 

 

 

 

Marco Sr.

[Carl]

I'm also seeing something geologic, something from a cave.