Assertion: phosphorus's allotrope | /r/HasProperty | black phosphorus
Facets:
Source sentences:
text: The third main allotrope is black phosphorus, which is even more stable than red phosphorus but not as useful.
text: Other allotropes are scarlet phosphorus, black phosphorus and diphosphorus.
text: Other allotropes are scarlet phosphorus, black phosphorus and diphosphorus.