From my "odd rock" pile

[mamabear]

found in a creek. Couldn't pass it up. The line of white encircles the rock.

 

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[Eu_citzen]

Could be sandstone. The round things could be pockets of clay.

There is another phenomena related to structural geology which I can't remember the name of right now to, that could explain it.
It would be helpful to know what those small things are for starters.

 

[Cariboo5]

Certainly looks like sandstone as Eu_citzen mentioned. Hard to tell from the picture what the white rocks are, could they be quartz ?

 

[curious kat]

That's a neat rock mamabear...I really like it! Looks like the rock has a pearl necklace...lol