Iron staining and?

[BC1969]

It is amazing what can be revealed after soaking rocks in a muriatic acid solution.
I have it resting on a US dime for crystal size.

 

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[fuss]

looks like quartz crystals to me, do you have a before pic?

 

[BC1969]

I wish that I had thought that far ahead.
Here are a couple of whole ones.