Which is the volcanic rock which contains the word trachyte in it's name?
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q108689 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'trachyte')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
volcanic rock: Q108689