[ahmet (OP)]

Hi Everybody,
I found this rock but I think this is a little bit different and  I wonder what is this. It has a properly spiral shaped. Can you help me please ?

WhatsApp Image 2018-09-23 at 12.15.02.jpg (67.11 kB . 1200x1600 - viewed 5924 times)

WhatsApp Image 2018-09-23 at 12.15.08.jpg (68.93 kB . 1200x1600 - viewed 6224 times)

[chris]

Yes, I'd say that is almost certainly a fossilised shell - probably a cerith, which were shallow-water dwellers.

Rhinoclavis_vertagus_shell.jpg (299.24 kB . 666x1626 - viewed 5432 times)

Photo credit: Butko CC BY-SA 3.0, commons.wikimedia.org

https://en.wikipedia.org/wiki/Cerithiidae

[ahmet (OP)]

Is it valuable or worthless?

[Bill S]

If you mean, does it have significant monetary value, the answer is probably “no”.  Much like works of art, the treasures we unearth tend to be of value to us, but create little interest on the “open market”.  There are exceptions, of course.  Back in the early 70s, when £5 was a significant sum, I saw a boy extract an apparently undamaged Aporrhais pespelecani from the Anglian (UK) Red Crag. A man watching him promptly offered him £5 for it.
A. pespelecani is common at that site, but an undamaged specimen is a “collector’s item” and was, obviously worth a fiver to that man.