Assertion: tungsten | /r/CapableOf | accompany tin ores
Facets:
value: always
type: DEGREE
Source sentences:
text: The actual mineral wolframite was also known to Agricola (16th century); he called it spuma lupi (wolfs cream) because tungsten, which always accompanies tin ores, interfered with the smelting of tin, converting it into the foam or scum of slags (“it devours tin as the wolf devours the sheep”).