<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31344700</termId><termName>vivianite</termName><termType>PT</termType><termNote><![CDATA[ Mineral comprising naturally occuring ferrous phosphate. Vivianite was described after discovery in the St. Agnes mine in Cornwall in 1817. Used in the pigment "blue ocher"; has been found in Roman paint residues. Ferrous phosphate is used as a colorant in ceramics. ]]></termNote><termCreatedDate>2026-03-30 20:32:58</termCreatedDate><relation><relationType>BT</relationType><termId>31320469</termId><termName>mineral</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31343414</termId><termName>ferrous phosphate</termName><termType>PT</termType></relation></term>  </Zthes>