Assertion: chalcopyrite's streak | /r/HasProperty | greenish gray
Facets:
Source sentences:
text: The streak of chalcopyrite is a greenish gray and it is soft enough that it can be scratched by a nail (12).
text: Chalcopyrite has a greenish gray/black streak.
text: Chalcopyrite does tarnish giving a blue, red and purple iridescence and has a greenish-gray/black streak.
text: Chalcopyrite is brittle and has a greenish gray streak.