What exactly is this?

[NikkiB530]

Anyone know what this is?

 

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[ARC]

Agatized coral ?

 

[Plug N Play]

Botryoidal Geode (botryoidal chalcedony)

 

[NikkiB530]

Thank you. This is so exciting to find out what these beautiful creations our earth formed! What is botryoidal ? Can u please explain a little more? Thank you

 

[tamrock]

https://en.m.wikipedia.org/wiki/Botryoidal