Assertion: tourmaline | /r/HasProperty | green
Facets:
value: usually
type: DEGREE
value: especially
type: OTHER
Source sentences:
text: The most expensive tourmalines are the pink (rubellite), green (verdelite) and blue (indicolite).
text: At times, tourmalines, especially green stones, may actually be too dark in saturation, which allows less sparkle out of the stone.
text: Some tourmalines, usually greens and blues, may have dark or closed C axes no matter the length of the crystal.