Psuedomorph agates?

[Steve1236]

Got a question for someone a lot more experienced than I, I find these sometimes where I find plume/dendrite agates just a hill over from where I dig for fire agates and they seem to be a mix of both agates, would these be considered psuedomorphic/alteration?

 

[fuss]

My understanding on pseudomorph's is limited but I don't think that is one, looks like iron stained chalcedony. Pretty sure pseudo's are mineral replacements yet retaining the same form like in a fossil, calcite replacing the coral then pyrite replacing the calcite etc, something along that line.

 

[DDancer]

fuss is correct. Pseudomorph materials are second, and sometimes third and fourth, minerals and formations derived from the original material or shapes left behind after they have been removed over time. A good example are Devils Dice also called Limonite after Pyrite and Goethite after Pyrite.
What your finding is a result of changes in the mineral solution as the minerals formed. Changes in temperature, density of silicates and inclusions of other minerals have a strong affect on silicates as they form *other minerals too*. The result is a grab bag. An attractive one in your case