Some mystery rocks

[Ivybridge]

Found these during a trip to a Goodwill.... any ideas on what they could be? They are small, some seem hollow, I know one is a geode and the one in the photo by itself that is flat is also very thin.

Thanks!
Angel

 

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[bevo]

I believe the bottom left and top center are chalcedony. pronounced cal-se-dony.

 

[Ivybridge]

Thank you bevo

 

[bevo]

chep

 

[nomad1]

Bottom left is a quartz geode. #4 on the top is chalcedony and #1 looks like it has a smattering of copper in it.

 

[bevo]

bottom center = geode