My favorite ones...

[Kathleen Anne]

These are some of my favorites, quartz mostly I think and some petrified wood. Please let me know if you have any more info on variety types etc. Thank you.

 

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[stdenis_jd]

1 & 2 - quartz. First one looks like about 1/3rd of a geode
3 - pet wood
4 - probably quartzite, possibly calcite - hardness test would define that
5 - gneiss with a little pocket of quarz
6 - same as #4, but more likely quartzite