"The average content of halloysite is less than 15%"
Try to keep up. Results from the 2019 announcement showed an average of 59% pure halloysite and significantly higher in some holes. HK is integrated halloysite-kaolin, quite common as kaolin is a precursor mineral to halloysite (just as your other HC account/s are precursors to this one). Based on my reading, there are at least three processing methods for extracting halloysite from kaolin.
Halloysite, Halloysite and Halloysite!!, page-490
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