Assertion: tourmaline | /r/HasProperty | a group of minerals
Facets:
value: with varying compositions
type: OTHER
value: jolyonralph
type: LOCATION
Source sentences:
text: Tourmaline is a group of minerals that all have the same crystal structure, but vary in chemical make up, color, and other properties.
text: Jolyonralph, tourmaline is a group of minerals with varying compositions.
text: Tourmaline is a group of minerals that can appear in many colors based on the elements that are present in its chemical composition.
text: Tourmaline is actually a group of minerals having various colors and compositions.