Please help identify! Unkown rock/sediment/Coral? Specimen

[Gemhunter323]

This rock was found on the coast of Malibu in a costal boulder field. The tides move around a lot of agates, quartz, and granite rocks. I have searched this area for long time and have not found another white rock like this. The rock is dense and has a very unique circle pattern on one side. I have shown it to several people, still unexplained. Thanks for looking! Zac

 

Amazon Forum Fav 👍

A Handbook of Civil War Bullets and Cartridges - Grab it through Amazon!

[Plug N Play]

Porcelain

 

[Tpmetal]

I agree some type of ceramic tile or something. Nature will not produce a pattern like that, at least I've never seen anything like that come from nature

 

[Back-of-the-boat]

Just a guess, but maybe a piece of broken tile that has been worn down by wave action this is a picture of the back of a tile, not all tiles look the same but this one has circles to hold the mastic.

 

[P.ALLEN]

could be dried plaster of paris, but I agree on with above that it could be a ceramic of some sorts

 

[Tpmetal]

could be dried plaster of paris, but I agree on with above that it could be a ceramic of some sorts

Yes this! If it's not hard enough to be ceramics this is it. Scratch it with finger nail. If it scratches it's plaster. If not probably ceramic

 

[Gemhunter323]

Scratch test, at home tests

Yes this! If it's not hard enough to be ceramics this is it. Scratch it with finger nail. If it scratches it's plaster. If not probably ceramic

I agree with you all and of course something man made was my first thought, however I have thought otherwise due to its makeup! It is heavy like a rock, dense throughout. I have tried scratching it and even taking a sharp edge to the back, it does not scratch like something man made. It is very hard and scratches like a stone. Are there any other at home tests anyone can suggest? Much appreciated, Zac.

 

[Plug N Play]

S. Calif. experienced massive fires followed by winter weather.
The muddy creeks feed the ocean ... and it eats it with wild abandon.

Sometimes referred to as Johnstone ...

http://www.coolfunpics.com/wp-content/uploads/2016/04/broken-toilets-mountain.jpg

 

[Gemhunter323]

Any way this could be a piece of ancient pottery? I found it practically in the ocean near a rock cave. Thanks

 

[Plug N Play]

Are there any other at home tests anyone can suggest? Much appreciated, Zac.

Try scratching the inside of your toilet cover ... you should get the exact same results.

 

[Gemhunter323]

Thanks, my first thought as well. I have been tempted to try and break it but i even if I threw it, it might not it is very dense like a stone. Sinks in water

 

[Tpmetal]

Thanks, my first thought as well. I have been tempted to try and break it but i even if I threw it, it might not it is very dense like a stone. Sinks in water

most likely porcelain then. Most likely modern and slip cast with that type of design. Probably tile.

 

[Plug N Play]

Thanks, my first thought as well. I have been tempted to try and break it but i even if I threw it, it might not it is very dense like a stone. Sinks in water

Your original pics show that it is a material that breaks in concoidal fractures.
Tough to break, long lasting and structurally stable, hard to scratch, and easy to clean ... procelain ...

I've collected and broken a lot of the stuff ... toilets, tiles, sinks, etc ...
It is hard to break, but can be done with extreme control.

 

[MadTom]

Agree

 

[Possum]

I agree, it sounds like porcelain to me, like someone stated above it's probably a broken piece of porcelain tile. The way the piece looks is because probably, over time, its been worked over pretty good by the elements... "D"