Interesting - it appears that from around 1970, halloysite was mined in the Terraced Hills, Nevada USA:
https://www.yumpu.com/en/document/read/21572421/halloysite-deposits-in-the-terraced-hills-washoe-county-nevada
With the halloysite sold to the “Nevada Cement Company” for use in none other than Portland cement production (at least as recently as 2015 - reference NV Bureau of Mines & Geology “The Nevada Mineral Industry 2007” and “The Nevada Mineral Industry 2015”):
See company details here: http://www.nevadacement.com
Very best to all shareholders.
Halloysite, Halloysite and Halloysite!!, page-725
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