Assertion: borax's boron | /r/HasProperty | rare
Facets:
value: fairly
type: DEGREE
value: in solar system
type: LOCATION
value: in the universe
type: LOCATION
value: in the earth's crust
type: LOCATION
value: in stars
type: LOCATION
Source sentences:
text: Boron is fairly rare in the solar system and makes up only 0.001% of the Earth's crust, but its naturally occurring compounds are quite common.
text: Although boron is a relatively rare element in the Earth's crust, representing only 0.001% of the crust mass, it can be highly concentrated by the action of water, in which many borates are soluble.
text: Elemental boron is rare and poorly studied because the pure material is extremely difficult to prepare.
text: Boron is rare in the Universe and solar system due to trace formation in the Big Bang and in stars.