The mineral is a rock that cannot be assimilated by the organism; it is called a mineral in ionic form, which is the case of mineral water, unlike sea minerals, which are called chelated minerals in colloidal solution.
In order to transform minerals into bioavailable minerals, photosynthesis and amino acids are required. This is the case for vegetables and sea water. Indeed, for sea water since 3.5 billion years it is the phytoplankton that transforms the mineral into minerals 100% absorbed by the human body.
It is clear that terrestrial mineral water has not undergone this transformation and consequently it contains dissolved rock that cannot be assimilated.