Assertion: tourmaline's quality | /r/HasProperty | poor
Facets:
value: usually
type: DEGREE
Source sentences:
text: However, the quality and size of the crystals that were produced by these early efforts were poor.
text: Bou Azzer has for many years been known as the locality for the world’s finest erythrite specimens, but specimens are sporadic, and the quality is usually poor (to be fair, this is a very soft mineral and hard to bring from mine to market without damage.)