Assertion: cassiterite | /r/HasProperty | rare
Facets:
value: typically
type: DEGREE
value: very
type: DEGREE
Source sentences:
text: Cassiterite as a Gemstone Gem-quality cassiterite is very rare.
text: Cassiterite is an ore which, when smelted, produces tin, and is typically rare, and usually cannot be purchased from caravans.