With water, vinegar and more water, the mystery stone is starting to give up its secrets.

When I washed it with vinegar the outer sandy-looking layer immediately began to melt. So that’s a limestone layer, I assume.

There appears to be a hole or cracked area in the center and a weird straight sliver in the upper left. That doesnt feel stony. Wonder if it could possibly be petrified wood?

This is a side shot. Another or same insertion … a sliver of something. Although, that area is also reminiscent of the bunch of leaf-thin layers.

And then that black circle … is it animal, vegetable or mineral? It looks like lichen. Too bad I don’t have a microscope. I wonder what mineral could make that yellow. Doesn’t look like sulfur. [I learnt ‘sulphur’ for that word.]

Getting more and more interesting.

The inside has to dry before I can get a good image.

With water, vinegar and more water, the mystery stone is starting to give up its secrets.

When I washed it with vinegar the outer sandy-looking layer immediately began to melt. So that’s a limestone layer, I assume.

There appears to be a hole or cracked area in the center and a weird straight sliver in the upper left. That doesnt feel stony. Wonder if it could possibly be petrified wood?

This is a side shot. Another or same insertion … a sliver of something. Although, that area is also reminiscent of the bunch of leaf-thin layers.

And then that black circle … is it animal, vegetable or mineral? It looks like lichen. Too bad I don’t have a microscope. I wonder what mineral could make that yellow. Doesn’t look like sulfur. [I learnt ‘sulphur’ for that word.]

Getting more and more interesting.

The inside has to dry before I can get a good image.