Assertion: borax's boron | /r/HasProperty | valuable mineral
Facets:
value: extremely
type: DEGREE
Source sentences:
text: Boron is an extremely valuable mineral and it is used in many products from cookware and medicine to nuclear waste storage and space exploration.
text: Boron, a valuable trace metal derived from foods and soils, is quite toxic in excess.
text: While Boron is a valuable trace element, like most other trace elements it is toxic when more than a trace is present!