The book predicted that "before 1985 mankind will enter a genuine age of scarcity" in which "the accessible supplies of many key minerals will be nearing depletion."

The Garnet group is a key mineral in interpreting the genesis of many igneous and metamorphic rocks via geothermobarometry.

Avocado trees are vulnerable to bacterial, viral, fungal and nutritional diseases (excesses and deficiencies of key minerals).

Chewing gum also increases saliva flow, which helps prevent enamel erosion because saliva strengthens teeth with key minerals.

Chemical analysis is also useful, usually through solvent extraction to determine key minerals.

Continuing availability of the key minerals from land-based sources at market prices.

We also asked which foods contained key vitamins like C, B, A, D, and E, and some key minerals like magnesium, zinc and iron.

The key minerals mined are black and brown coal, clay, graphite, limestone and other building materials.

Limits may be set also by deficiencies of nitrogen and other key minerals in the soils.

Another technique to reduce the risks from a cartel is to find new overseas suppliers of key minerals.