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Date Posted: 17:56:34 03/25/02 Mon
Author: Steve Herschbach
Subject: Re: Cleaning quartz? - Oxalic Acid
In reply to: John B. 's message, "Re: Cleaning quartz?" on 17:35:56 03/25/02 Mon

The best thing I have found for iron stain is oxalic acid. It's recommended in all the rock collecting books. It is the active ingredient in most rust/stain removers. You can by it in crystal form at some druggists; that way you can mix up a stronger batch. Some rock shops sell it by the pound for only a few dollars a pound. The druggists sell it by the ounce, so it is much more expensive. If you can't find any in crystal form, just look for liquid versions in the toilet bowl section of your store. The brand I have used is "Whink". Look on the ingredients list for it otherwise.

If using the crystal form do not mix it so strong that the solution turns yellow, as this will create it's own stain.

It is a very weak acid and so let it soak. Very safe as acids go, but still poisonous if ingested. Getting it on your skin is no big issue. Just rinse it off. Keeping the solution warm speeds things up. For lots of quartz or other rock samples you can literally mix up a big bucket of the stuff and let it all soak.

Steve Herschbach

See here for details Cleaning Quartz

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