<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31344619</termId><termName>diopside</termName><termType>PT</termType><termNote><![CDATA[ A green, calcium magnesium silicate mineral sometimes used as a gemstone; a pyroxene-type mineral with short, monoclinic crystals. The transparent to translucent crystals have either a square or octagonal cross section. The color of diopside crystals ranges from light to dark green. Powdered diopside is used as a matting agent in ceramic glazes. ]]></termNote><termCreatedDate>2026-03-30 20:32:56</termCreatedDate><relation><relationType>UF</relationType><termId>31344620</termId><termName>MgCaSi2O6</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31344621</termId><termName>diopsides</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31320469</termId><termName>mineral</termName><termType>PT</termType></relation></term>  </Zthes>