Loam is considered the ideal soil for most plants because it has a balanced mix of:

* Sand: Provides good drainage and aeration.

* Silt: Offers water retention and nutrient availability.

* Clay: Contributes to structure and holds onto nutrients.

While loam can contain some organic matter, the key feature you mentioned is that it is made of all minerals. This means it's classified as mineral soil, as opposed to organic soils like peat or muck.