Tell me mineral supergroup whose name has the word tourmalines in it.
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:/instance of/ wd:/mineral supergroup/ . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'tourmalines')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 