🔎 UNIDENTIFIED ID help Ozarks rocks

[maccounty]

Found these in the creek near my house, Southwest Missouri, McDonald County. They appear (to me) some type of quartz. Kinda like a brain if that makes sense. The bubble one I haven’t really noticed before, (first two pictures and seems different than the others) very interesting and wondering how them bubbles formed. I haven’t cleaned any up yet, they are as found. Just trying to figure out what they might be. Any help is appreciated. Thank you.

 

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[DizzyDigger]

I've no idea what they are, but think I probably would have brought them home, too. Cool looking rocks!