When tests are done on clay, several minerals and materials are found but iron seems to be present in high levels in general when clay is tested.
Clay, like other soil, is made from rocks which usually contain various minerals. As such, clay contains various minerals as well including:
- Iron
- Silica
- Magnesium
- Calcium
Iron however, seems to be the most abundant in clay and is said to comprise up to 30% of some clay soils.
In conclusion, iron is a highly abundant mineral in clay such that when clay is tested, iron is found in high levels.
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