Rock id?

[jeepjoe79]

Hey everyone...i love picking up interesting rocks while im out exploring, but dont know to much about them. Wondering if anyone can ID this for me...it appears to be a quartz base with tiny holes all over it. Thanks for looking!

 

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[mamabear]

I find a lot that look like pic # 3. I live in SE MO. We have a lot of foissilized shells & corals etc. I have always wondered what these particular rocks are, so I will be watching to see what the replies are.

 

[austin]

Top one may be a fossil bi-valve(clam). Gave away fossil book and can't remember the name, but the shell part is on the other side. Other piece may be coral.

 

[rockhoundrich]

definately a shell top one and coral on the bottom the quartz looking stuff is most likely calcite put it under a black light and it should glow