Iron ore with 72% iron content is Magnetite.

Magnetite is a type of iron ore that contains a high percentage of iron (Fe). It is one of the most abundant and widely distributed iron-bearing minerals on Earth. Magnetite has the chemical formula Fe3O4, which means it is composed of three atoms of iron (Fe) and four atoms of oxygen (O).

Key Points:
- Iron content: Magnetite has a high iron content, typically ranging from 72% to 76%. This makes it a valuable source of iron for industrial purposes.
- Physical properties: Magnetite is a black or dark gray mineral with a metallic luster. It has a hardness of 5.5-6.5 on the Mohs scale, which means it is relatively hard. The mineral is also magnetic, meaning it is attracted to magnets.
- Occurrence: Magnetite is commonly found in igneous and metamorphic rocks. It can also occur as a detrital mineral in sedimentary rocks. Large deposits of magnetite are found in countries such as Australia, Russia, China, and the United States.
- Industrial uses: Magnetite is primarily used as a source of iron in the production of steel. It is also used as a pigment in paints, magnetic recording media, and as a catalyst in the production of ammonia. Additionally, magnetite has medical applications in magnetic resonance imaging (MRI) and as a treatment for anemia.
- Other iron ores: While magnetite is the correct answer for the given iron ore with 72% iron content, it is worth noting that there are other types of iron ores with different iron contents. For example, hematite (Fe2O3) typically contains around 70% iron, while goethite (FeO(OH)) and siderite (FeCO3) have lower iron contents.

In conclusion, the iron ore with 72% iron content is magnetite. Magnetite is a valuable source of iron and has various industrial uses due to its high iron content and magnetic properties.