<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31438503</termId><termName>rhyolite</termName><termType>PT</termType><termNote><![CDATA[ Any of a number of extrusive acid igneous rocks, usually porphyritic and exhibiting flow lines, with phenocrysts of quartz and alkali feldspar in a glassy to cryptocrystalline groundmass; the extrusive equivalent of granite. ]]></termNote><termCreatedDate>2026-03-30 20:58:11</termCreatedDate><relation><relationType>UF</relationType><termId>31438504</termId><termName>liparite</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31438505</termId><termName>acid igneous rock</termName><termType>PT</termType></relation><relation><relationType>BT</relationType><termId>31412239</termId><termName>extrusive rock</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31457322</termId><termName>quartz porphyry</termName><termType>PT</termType></relation></term>  </Zthes>