What kind of acid ? I hope not lisergic...........
I've try with lemon juice, but I haven't mark alterations.
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I really like the color of it.
I want one.........
usually HCL is what we use. We used to use that treatment to get fossils out of CaCO3. Just put the fossils in a vat of dilute acid and leave them under a hood for several days and the fossils which are silica are left behind in a pile of mud.
Iron will show rust if it's native iron which is so rare you'd have a better chance finding a diamond. Iron minerals over time will slowly change but that takes like thousands of years. Depending on the chemistry though if the conditions are right you might see a fine coating of FeO also known as Limonite or rust.