<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31344654</termId><termName>barstowite</termName><termType>PT</termType><termNote><![CDATA[ A rare lead compound, a transparent to pale white mineral in the monoclinic system. It was first identified in the lead-antimony vein at the southwestern end of Bounds Cliff, Cornwall by Cornish mineral collector Richard A. Barstow. It has also been found as a corrosion product on lead artifacts. ]]></termNote><termCreatedDate>2026-03-30 20:32:57</termCreatedDate><relation><relationType>BT</relationType><termId>31320469</termId><termName>mineral</termName><termType>PT</termType></relation><relation><relationType>BT</relationType><termId>31343459</termId><termName>lead compounds</termName><termType>PT</termType></relation></term>  </Zthes>