does anyone know, what type of stone? Thank you!

[Gladys]

[Chad G.]

 Agate marble dyed blue, possibly carnelian, never the less a banded type ?? nice bullseye pattern !!

 

[Gladys]

1 hour ago, Chad G. said:

 Agate marble dyed blue, possibly carnelian, never the less a banded type ?? nice bullseye pattern !!

 

Thank you so much Chad for the info. how the heck do they dye stone? that's amazing

[Chad G.]

23 minutes ago, Gladys said:

Thank you so much Chad for the info. how the heck do they dye stone? that's amazing

Enter "Dyed agates" of "dyed agate marbles" into the search bar of whichever search engine you're using, this is just one link in a multitude of reply's I got.

LINK : https://www.marblesgalore.com/marbles/how-agate-marbles-are-dyed/

[Gladys]

10 hours ago, Chad G. said:

Enter "Dyed agates" of "dyed agate marbles" into the search bar of whichever search engine you're using, this is just one link in a multitude of reply's I got.

LINK : https://www.marblesgalore.com/marbles/how-agate-marbles-are-dyed/

Of course! potassium ferro-cyanide why didn't I think of that? LOL.........Thank you!! your so sweet! 

[Chad G.]

3 hours ago, Gladys said:

Of course! potassium ferro-cyanide why didn't I think of that? LOL.........Thank you!! your so sweet! 

Pot what ?? I'm no chemist myself either, I guess the chemicals they do it with are quite caustic and not very good for your health either

[bumblebee]

That's a very nice agate, likely vintage handmade in Germany, in a rare blue color.

Agate is a form of chalcedony. Here's a useful excerpt from an 1887 London paper article of an interview with a mineralogist. Note he says carnelian is not banded, but elsewhere I have seen carnelian is used to describe the typical reddish color of banded agates...I need to pick up the slack on my research!:

[Gladys]

Thank you Bumblebee!! great info! very cool

[Chris Parson]

Agate, for sure!