Many soil colours are due to various iron minerals.

With the infrared filter, the different iron minerals emit different colors, and the camera can better differentiate between them.

There are mining sites for calcite, and iron minerals.

The most noticeable feature on a large scale is the brick-red color, caused by oxidation of iron minerals in the rock.

Oxidation of iron minerals causes the redness of the rocks.

They can contain iron minerals from the following groups: oxides, carbonates, and silicates.

They normally contain fossil debris and sometimes the fossils are partly or entirely replaced by iron minerals.

There are also many iron minerals that can actively be used in dechlorination.

The most reactive of the iron minerals are the iron sulfides and oxides.

There are also numerous excavations that included iron minerals.