The weirdly shaped rock - PICTURES.

Cher, to me, for what it's worth, not a lot, it looks granitic. Suspect the stripes water-surface deposit

Its man made alright. we have these things called Manos and metate which are mortars and pestles usd by the ancients. You may hve what could be a neolithic artifct. IS there a university with an archaeology department near to you? Id take some pictures of the site (wide angle and close up with a little red fag (or any bright colr) right where you found this thing and take the artifact and the pictures to the department nd see whether you can get any ideas or even help.
Over here in US e hve many laws governing disturbnce of artifcts, Im sure EU hs something similr

I'm greatly thankful for Your reply, farmerman. I was also considering this piece to be some sort of ancient pestle, but what concerned me was the size. Usually, the pestles and mortarts are quite bigger in size. It's something that You can hold in your palm with a good grip. But, if this is some sort of miniature version of it, then yeah, why not. Would You say, You have any idea of how old it might be?

p.s. adding more pictures

Is that some bllack powdery stuff on the rounded "top"?

Im no expert in artifacts but could it be for "mulling" or mixing very fine powders or small amounts of flavorings?

The stone appears to be a rhyolite which is dense enough for that kind of use.

Unfortunately, I did not see any black powder on the top of the rock. Another version, I consider, maybe this would have been a cork for a bottle?

Cherrie I've seen such patterns, they're natural (at least the black ones toward the "bottom". Probably deposits of carbon or some other black substance following cracks

Gotta admit tho, the white ones give one pause

Could You please explain what do You think about the white patterns? What would they mean?

I agree it's a bit too small for it likely to be a pestle (which is what it looked like without the size perspective). Bottle cork is another good guess. How about a playing piece for a game of some type? Maybe a pawn for a very old form of chess or something?

Sure do look man-made, don't they Cher

they look like those celtic knots we see in jewelry.

I like the game piece idea.

I am really no expert in these kinds of things, so I can't tell for sure. But I believe and appreciate Your expertise . Would You say that those kinds of white patterns that we see in this piece are not usual in common stones? And what would be your guess about why does this piece have them?

I looked up some ancient game/chess pieces in google search and found these : https://s-media-cache-ak0.pinimg.com/736x/77/81/5e/77815e4752ac41a261aaa5fdad9b1908.jpg

http://history.chess.free.fr/images/medieval/sandomierz-03.jpg

http://history.chess.free.fr/images/medieval/Florence-Pawn-01-r.jpg

I have to say, the shapes and sizes look very similar. It could be a chess pawn indeed.

Farmerman, which parts of the piece remind You of celtic knots?
Do You mean those two X's ?

Also looked up some meanings to the double X...Found this : "X signifies betrayal as to cross someone - XX = double cross".
Could maybe another version for this piece be some sort of prediction, divination stone ?

"In the old Semitic languages, X represented the cross

Code 33 (Z=1, Y=2, X=3 ) - a reference to Freemasonry and ritual sodomy.

The appearance of any double X form in an Occult context may be a secretive embedding of the square and compass of Freemasonry, marking their territory and performing symbol magic.

Within the double X two very important symbol letters appear, the W and X. The W is above, the M below. They are mirrored, as above, so below."

I think Latvians did practice a lot of occultism, pagan rituals in their past. Or maybe I'm digging too deep?

Probably moreso than I

Am flattered

As a former rockhound I'd say yes, such shapes common only when so marked by the humanoid

But Cher I'm no expert by any means. Think black stripes and black stars atop as natural