Question: "Which is {streak color} of {feldspar}, where {label in sign language} is {Csc-blanc-spreadthesign.ogv} ?"
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q170258 wdt:P534 ?answer . ?answer wdt:P2919 ?x FILTER(contains(?x,'Csc-blanc-spreadthesign.ogv'))}