Tell me me a allotrope of carbon whose name consist of the word "carbon" and whose shape crystal structure
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q622460 . ?sbj wdt:P1419 wd:Q895901 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'carbon')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
allotrope of carbon: Q622460 crystal structure: Q895901