Show of Hands

Perfect.

This user is currently being ignored

Usually igneous or sedimentary, though metamorphic can be possible.

Actually, they form closer to a process like rock candy.

It's true. It actually is a lot like making rock candy.

igneous (rocks formed from lava) rock. While it's possible for geodes to form in certain metamorphic rocks (rocks made from other rocks due to heat/pressure/etc.), crystals formed within metamorphic rocks tend to be quite small.

here are some geodes:

goo.gl/dEunA3

goo.gl/lKQS5m

I object. Do they form in sediment and lava equally? Or do they form in sediment more often? 😏

Both are pottery conducive to it, as all they really need is porous rock with a cavity. Since sedimentary rock is more common, I imagine more geodes are sedimentary geodes.

Yes, I'm being a dork.

My objection stems from syntax of your question. It's essentially asking which is more common. I guessed sedimentary.

I thought I had distinguished it well enough. But it was 3am, so I thought a lot of things.

I had a small pile of geodes in my back yard creek. So at one point my creek was hot and pressurized?

Could be. That, or there were small animals/nests/etc. encased in stone, which, if the stream has been there long enough, is totally possible.