Assertion: opal's variety | /r/HasProperty | brown
Facets:
value: to yellow
type: OTHER
value: in colour
type: OTHER
value: usually
type: DEGREE
value: of various shades
type: OTHER
Source sentences:
text: In colour these varieties are usually brown, yellow, or red, of various shades.
text: Iron-rich tourmalines are usually black to bluish-black to deep brown, while magnesium-rich varieties are brown to yellow, and lithium-rich tourmalines are almost any color: blue, green, red, yellow, pink, etc.