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Author: Subject: Mystery rock?
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[*] posted on 15-5-2017 at 16:57
Mystery rock?

So I got some rocks from my grandfather that we found in crecent lake, oregon. I took a small sample and put it in some HCL, expecting a green color due to it being a red rock. Suprisingly, it turned orange. Any clue what this rock is? I really hope it is cinnabar.
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Amos
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[*] posted on 15-5-2017 at 17:58


Most likely small amounts of iron(III). Pretty commonplace for rocks I've tried putting in hydrochloric acid. I believe cinnabar is usually pretty inert to acids, and if it did dissolve you'd be more likely to encounter a colorless solution and the release of putrid-smelling hydrogen sulfide gas.
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[*] posted on 16-5-2017 at 05:25


Quote: Originally posted by Amos  
Most likely small amounts of iron(III). Pretty commonplace for rocks I've tried putting in hydrochloric acid. I believe cinnabar is usually pretty inert to acids, and if it did dissolve you'd be more likely to encounter a colorless solution and the release of putrid-smelling hydrogen sulfide gas.


Oh well. Now I just need to precipitate the stuff.
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