Assertion: tourmaline | /r/HasProperty | created
Facets:
value: due to metamorphism
type: CAUSE
Source sentences:
text: Tourmaline is created when liquid magma from a volcanic explosion cools down and transforms into igneous rocks.
text: In one theory, when tourmaline is created due to metamorphism, the crystal structure is distorted from the stable state due to rapid cooling to generate positive and negative electric poles at the two ends of a crystal.