Assertion: astatine's appearance | /r/HasProperty | dark
Facets:
Source sentences:
text: Astatine is likely to have a dark or lustrous appearance and may be a semiconductor or possibly a metal; it probably has a higher melting point than that of iodine.
text: " to "Astatine is likely to have a dark or lustrous appearance and be either a semiconductor or a metal, and it will probably have a higher melting point than iodine.
text: It is believed that astatine has a dark appearance and that it could possibly be a semiconductor.
text: From the lead: "Elemental astatine has never been viewed..." and then "may have a dark or lustrous appearance".