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 Post subject: Analysis of Yunzi stones (lead, etc)
Post #1 Posted: Mon May 08, 2017 1:39 pm 
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I had seen threads and conversations here and elsewhere about yunzi stones having lead and being composed of a formula known only by the creators, etc.

Well, a while back I ordered some double-convex yunzi stones from YMI. A couple of them came chipped or split in half so I sent them to a friend of mine who is a chemical engineer. He put them through one of these https://en.wikipedia.org/wiki/X-ray_fluorescence and gave me the results:

The stones are both primarily made of silicate. Likely tectosilicate or nesosilicate. There was a small iron peak and a small lead peak. The black stones had more carbon present, but otherwise were mostly identical. The iron is likely from whatever grinding/shaping process they went through.

https://en.wikipedia.org/wiki/Silicate_minerals

If you soak/wash them when you get them, the lead exposure should be extremely small. Basically, they are quite literally go "stones" (obviously manufactured)


This post by dracflamloc was liked by 4 people: Galation, joellercoaster, sybob, wolfking
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