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Cleaning Hornblende?

Index -> Conserving, Preparing and Cleaning Minerals

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Aradebil

Joined: 05 Jan 2010
Posts: 1
Location: Budapest

Posted: Apr 30, 2011 07:50 Post subject: Cleaning Hornblende?

Hello!

I collected this small piece of hornblende at Denevér-táró,Szarvasko;,Hungary ( https://www.mindat.org/loc-66195.html )
Is there any way to clean this specimen?I think the main "dirt" is Fe-oxides. Oxalic acid may work?
sorry for the poor img quality

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