Assertion: cassiterite | /r/HasProperty | major discovery
Facets:
value: during the bronze age
type: TEMPORAL
Source sentences:
text: During the Bronze Age, cassiterite was a major discovery used towards technological advancement, as it was used to form the alloy bronze.
text: Gravel beds in some places contain accumulations of heavy metallic ore minerals, such as cassiterite (a major source of tin), or native metals, such as gold, in nuggets or flakes.
text: During the Bronze Age, cassiterite was a major discovery used towards technological advancement, as it was used to form the alloy bronze.