What are these stones?

[thriftingeyes]

I was told the brown was agate or jasper, not sure bout the black and white. They are necklaces. I paid $2 each.

Tia

 

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[tamrock]

It's a brecciated mineral of some kind maybe?. An image of brecciated black and white marble is closest thing I could find, but I'm not so sure it would be that either. It might be even some kind of man made composite of a white stone bonded with a polymer. I just can't find an example of any natural stone like it, but it could exist for all I know.

 

[GibH]

Howlite possibly, but the veins look too dark.

 

[flinthunter]

I'm going with howlite for the black and white beads.

 

[randazzo1]

It's a brecciated mineral of some kind maybe?. An image of brecciated black and white marble is closest thing I could find, but I'm not so sure it would be that either. It might be even some kind of man made composite of a white stone bonded with a polymer. I just can't find an example of any natural stone like it, but it could exist for all I know.

I think tamrock hit it on the head with composite.