For example, halloysite samples found in Wagon Wheel Gap, Colorado, United States are suspected to be the weathering product of rhyolite by downward moving waters.

[4] In general the formation of clay minerals is highly favoured in tropical and sub-tropical climates due to the immense amounts of water flow.

When feldspar occurs near the surface of lava flows, the CO2 concentration is high, and reaction rates are rapid.

[4] A highly refined halloysite is mined, then processed, from a rhyolite occurrence in Matauri Bay, New Zealand.

[19] The Dragon mine, located in the Tintic district, Eureka, Utah, US deposit contains catalytic quality halloysite.

[20] Commercial Uses of the halloysite produced at the Matauri Bay deposit in New Zealand include porcelain and bone china by manufacturers in various countries, particularly in Asia.

[13][14][15][16] Laboratory studies Typical chemical and mineralogical analyses of two commercial grades of halloysite are:[32]