Editing Chalcopyrite (section)

== Identification ==
Chalcopyrite is often confused with [[pyrite]] and [[gold]] since all three of these minerals have a yellowish color and a metallic luster. Some important mineral characteristics that help distinguish these minerals are hardness and streak. Chalcopyrite is much softer than pyrite and can be scratched with a knife, whereas pyrite cannot be scratched by a knife.<ref>{{cite web |url=https://www.oakton.edu/user/4/billtong/eas100lab/hardness.htm |title=Mohs Hardness Test |website=www.oakton.edu |access-date=2019-12-20 |archive-date=2022-03-23 |archive-url=https://web.archive.org/web/20220323200054/https://www.oakton.edu/user/4/billtong/eas100lab/hardness.htm |url-status=dead }}</ref> However, chalcopyrite is harder than gold, which, if pure, can be scratched by [[copper]].<ref>{{cite book |url=https://learnbps.bismarckschools.org/mod/book/view.php?id=89466&chapterid=38280 |title=Earth's Minerals |chapter=Hardness |publisher=LearnBPS: Bismarck Public School's Blended Spaces|access-date=2019-12-20}}</ref> Additionally, gold is [[malleable]], while chalcopyrite is [[brittle]].<ref name=umn /> Chalcopyrite has a distinctive black streak with green flecks in it. Pyrite has a black streak and gold has a yellow streak.<ref>{{Cite web |url=https://geology.com/gold/fools-gold/ |title=Fool's gold and real gold – How to tell the difference |website=geology.com |access-date=2019-12-20}}</ref>