Haematite
/ˈhiːmətaɪt/
Definition 1 of 1
Pro Tip 1/3Mineral Composition
Haematite is specifically iron oxide, which means it's a compound made of iron and oxygen. 
Haematite's red streak is due to its iron oxide content.
Pro Tip 2/3Color Indicator
Haematite's color ranges from red to brown, which is distinctive among other minerals. 
The reddish streak left by haematite helps geologists identify it.
Pro Tip 3/3Industrial Use
Haematite is mostly used in the context of iron production, which is critical for manufacturing. 
Steel factories often source haematite for their iron needs.