<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31375464</termId><termName>quartzite</termName><termType>PT</termType><termNote><![CDATA[ A metamorphic rock composed largely of granular quartz which is cemented by silica forming a homogeneous mass of very high tensile and crushing strengths; especially used as a building stone, as gravel in road construction, and as aggregate in concrete. ]]></termNote><termCreatedDate>2026-03-30 20:41:16</termCreatedDate><relation><relationType>BT</relationType><termId>31344776</termId><termName>metamorphic rock</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31412311</termId><termName>ganister</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31412313</termId><termName>silcrete</termName><termType>PT</termType></relation></term>  </Zthes>