Found a bunch of calcite and what I think might be quartz? It is about twice as heavy as the calcite and doesn’t scratch as easily.

Another thing that confuses me is that all of these minerals are on the perimeter of a 10ft by 10ft sinkhole. They were about 6” to 2’ from the edge of the sinkhole. They were found on the surface to about 6” deep. They also seem to only go about 1/3 of the way around the sinkhole.  I didn’t find any minerals outside of these dimensions. I moved a lot of dirt in and around the sinkhole but found none anywhere else.

How did they get there?

Franklin County/Missouri.  I am going back and going to stay focused on tracing the calcite through the soil.

It is really pure clay soil once a dig down about 1ft or so. I haven’t found any in the thick clay. Right now I am going to keeping tracing the path and see if I can find the motherload lol

Thanks for the response

i'd call it some pretty cool stuff
looks to me like you're having more fun than any rockhound should have by himself, so i hope you have a buddy with you, especially around a sinkhole.
it looks like you are following a vein or layer of travertine with pockets of, lots of pockets, of calcite. Travertine is a calcium carbonate and is sometimes called 'cave onyx', hence your sinkhole. You may be breaking through the roof of a large hollow vug, sometimes called a cave.    if you're at the roof, i wonder what the floor looks like 
look up travertine veins and outcrops in Missouri.
and Galena is a good guess for that area.
if you have the opportunity to keep digging i certainly would. if you get to undisturbed areas, go slow and look for all kinds of other minerals in pockets.
like in your second picture, the two dark crystals sticking up in the middle of the 'flow', are they 'terminated' crystals,
are they smoky quartz
and this looks like it might be a good reference for you for all your future rockhounding adventues.
https://www.gutenberg.org/files/59737/59737-h/59737-h.htm#c8

good stuff. have fun be careful, and keep us posted.

Very good, Anthony, and thank you for the info.
yes, from what you've been finding already, following that vein looks interesting and fun enough.
But if it's like it is here, it's too hot to do much digging this afternoon anyway,
of course you have the shade of that tree 
That's the nice thing about digging by hand, you don't have any choice but to take your time.

Enjoy yourself and thanks for the report.