Assertion: tourmaline | /r/HasProperty | polar crystalline material
Facets:
Source sentences:
text: (1) That tourmaline is not a ferroelectric substance but is a polar crystalline material.
text: (1) That tourmaline is not a ferroelectric substance but is a polar crystalline material.
text: (1) That tourmaline is not a ferroelectric substance but is a polar crystalline material.