A rust streak is a streak in iron ore veins that was oxidized. Rust forms when oxygen oxidizes iron ore.
yes
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Bornite, also known as chalcopyrite or peacock ore, is a sulfide mineral. It got this name from its blue and purple colors when it tarnishes.
Yellow Copper Ore, Peacock Ore (encountered with acid- tarnish)
The mineral is called bornite.
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Uranium ore - Uraninite - has a black streak and a hardness of 5 to 6, which is about the same as steel.
Magnetite
The mineral is hematite.
Magnetite can be black and it has a black streak. It is metallic and iron ore