Assertion: meteorite's iron | /r/HasProperty | rare
Facets:
value: very
type: DEGREE
value: always
type: DEGREE
Source sentences:
text: Iron meteorites are easily found, because native iron is rare.
text: Iron meteorites are easily found, because native iron is rare.
text: Metallic iron in rocks from the Earth is very rare.
text: Compared to the other two main groups, stony-irons are extremely rare, making up less than 2% of all known meteorites.
text: Pure iron has always been rare and so there is little wonder that iron meteorites were especially coveted by ancient civilizations as raw material for cultic knives and weapons in times prior to the Iron Age.