The ore which contains both iron and copper is chalcopyrite. Its molecular formula is CuFeS2. Its molecular formula shows that it contains both iron as well as copper.
Iron and magnesium are the two common minerals in basalt. The rock is poor in silica though.
Two minerals that make up nodules are manganese (usually as manganese oxide) and iron (usually as iron oxides or hydroxides). These minerals precipitate out of seawater onto the seafloor, gradually forming into nodules over time.
Two types of meteorites that can hit Earth are stony meteorites, which are made of mostly silicate minerals, and iron meteorites, which are composed mainly of iron and nickel.
Calcium and iron must be included on the Nutrition Facts label.
The two main forms of iron found in food are heme iron, which comes from animal sources like meat and fish, and non-heme iron, which comes from plant sources like spinach and lentils. Heme iron is more easily absorbed by the body compared to non-heme iron.
Hematite and magnetite are two common minerals that contain significant amounts of iron. They are both iron oxides and are often used as sources of iron ore for industrial purposes.
Dark (or ferromagnesian) silicates contains ions of iron (iron=ferro) and/or magnesium in their structure.
Iron pyrites, plumbago.
Iron and zinc
Iron and Mica are two minerals in which India is self suffient.
The two basic groups of metallic mineral resources are ferrous minerals, which contain iron, and non-ferrous minerals, which do not contain iron. Ferrous minerals include iron ore, while non-ferrous minerals include copper, lead, zinc, gold, and silver.
Iron and magnesium are the two common minerals in basalt. The rock is poor in silica though.
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Two minerals that make up nodules are manganese (usually as manganese oxide) and iron (usually as iron oxides or hydroxides). These minerals precipitate out of seawater onto the seafloor, gradually forming into nodules over time.
The two minerals commonly found in gneiss that contain iron and magnesium are biotite, a dark-colored mica mineral rich in iron and magnesium, and amphibole, a group of dark-colored mineral silicates that also contain iron and magnesium.
Iron and zinc.
I think the most common ores are magnetite and haemitite.