2019117 ensp 0183 enspHighly pure halloysite is mined from a rhyolite occurrence in New Zealand Its uses include porcelain and china Halloysite is an efficient adsorbent both for ions and anions It has also been used as a petroleum cracking alyst and Exxon has developed a cracking alyst based on synthetic halloysite in the 1970s Occurrence ensp 0183 ensp