With the good weather I've decided to try and re-calcine my galena. So far with no luck: I started again at around 200 and over the course of several hours increased it slowly up to 500, and left it at that temperature for about two days. No visible change was noticed in the ground galena, as you can see in the picture. It still looks like uncalcined galena. I remember reading a method of extraction using nitric acid, then using acetic acid, so I might try that method when I have an extra few hours during a nice day.
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