Assertion: tourmaline | /r/HasProperty | followed by fine pulverization
Facets:
Source sentences:
text: A fine powder of tourmaline is selected from the tourmaline country rock that contains tourmaline followed by fine pulverization, the electric charges being cancelled by each other due to the attraction and contact of positive and negative electric poles thereof.
text: A fine powder of tourmaline is selected from the tourmaline country rock that contains tourmaline followed by fine pulverization, the electric charges being cancelled by each other due to the attraction and contact of positive and negative electric poles thereof.
text: A fine powder of tourmaline is selected from the tourmaline country rock that contains tourmaline followed by fine pulverization, the electric charges being cancelled by each other due to the attraction and contact of positive and negative electric poles thereof.