Assertion: cassiterite | /r/HasProperty | chief tin ore
Facets:
value: throughout ancient history
type: TEMPORAL
Source sentences:
text: Cassiterite has been the chief tin ore throughout ancient history and remains the most important source of tin today.
text: In fact, it is the chief ore of tin and was one of the first metal alloys.
text: Cassiterite has been the chief tin ore throughout ancient history and remains the most important source of tin today.
text: Cassiterite has been the chief tin ore throughout ancient history and remains the most important source of tin today.
text: Cassiterite was the chief tin ore throughout ancient history and remains the most important source of tin today.