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Techniques for CollectorsCleaning Dolomite/Ankerite and Chalcopyrite

13th Aug 2019 23:14 BSTJamal Wilson

Hello all,

I found this Dolomite (possibly Ankerite) specimen covered in small Chalcopyrite crystals in a copper mine located in Luxembourg. As you can see the specimen has been subject to weathering. Is there anyway I can recover the natural white color of the dolomite and metallic luster of the Chalcopyrite without damaging either mineral? 



13th Aug 2019 23:29 BSTAlfredo Petrov Manager

Sodium dithionite solution, commercially sold as "Iron Out" in the USA, but probably different names in other countries. Usually also has other added ingredients, like sodium citrate for buffering. You can also make it yourself - Look up the recipe for "Waller solution".

Do NOT use acids, most especially not oxalic acid, as that would ruin your specimen.

14th Aug 2019 16:59 BSTJamal Wilson

Thank you for the advice! I was actuallly able to buy Iron Out online from a Europe based company. Will give it a try.
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