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RE: A new crystal found in the back room of our store.
Copper sulfate is lab grown in a pure form and is a richer blue. We have some single copper sulfate crystals in our store. They are 2"-3". The crystal above, I was told by my resource, is extracted from an actual chalcanthite cluster in matrix. It has impurities in it that are found in the natural state. It is a darker blue than pure copper sulfate. I did check out your post on copper sulfate crystals and cupric sulfate. Pretty cool. Too late to upvote though.
I had no idea that the color was different. Cool.
No comment on the crocoit?
It's pretty, but I knew nothing about it, so I didn't have anything substantial to say about it. Now I know it's a short Wikipedia walk from the mineral to one of my favorite paintings. Thanks for inspiring me to learn a few things!