Ironstone Fossil Stability

[Fossil'n'Roll]

I found someone selling a few Bolivian trilobites in ironstone nodules and I really like this one (above). Most of the others have an oxide coating (example below) and this one does look very slightly yellowish. Will it (or other fossils in ironstone like those from Mazon Creek) be stable long term? I don't really want to buy it if it will just rust away.

 

[Wrangellian]

I don't think there is ever a problem of these and Mazon fossils deteriorating. It's fossils made of pyrite that you have to worry about.

[Fossil'n'Roll]

Thanks. I thought that might be the case since I couldn't find anything about them deteriorating, but figured I'd ask anyway. Better safe than sorry.

[Tidgy's Dad]

Nice trilo! 

This kind of preservation is quite stable 

[Raggedy Man]

Tidgys Dad is quite correct. These trilobites are stable and you shouldn't have anything to worry about. As Wrangellian stated, its the ones made from pyrite that you need to worry about.