Assertion: tourmaline's pole | /r/HasProperty | heated to about 1000° c.
Facets:
Source sentences:
text: When heated to about 1000° C., the permanent electric poles vanish and do not develop any more even when an external electric field is applied thereto.
text: When heated to about 1000° C., the permanent electric poles vanish and do not develop any more even when an external electric field is applied thereto.