The components of alloys are ordinarily themselves metals, though carbon, a nonmetal, is an essential constituent of steel.
Potassium is a mineral that forms positive ions (electrically charged particles) in solution and is an essential constituent of cellular fluids.
"Culture" in the 1970s was of interest inasmuch as it was an essential constituent of multiculturalism, understood in terms of liberal tolerance and cohabitation, rather than as an imaginative inheritance that needs to be periodically reassessed and reused.
Other causes include infiltrative diseases of the thyroid, severe iodine deficiency (iodine is an essential constituent of thyroid hormone and is available only from the diet), and certain drugs (e.g., lithium carbonate, iodine, and iodine-containing drugs).
Maxwell's analytic treatment of speed governors is generally regarded as the founding paper on cybernetics, and his "equal areas" construction provided an essential constituent of the theory of fluids developed by Johannes Diederik van der Waals.
Careful chemical analysis of a basalt will reveal the presence of most of the geochemically scarce metals too, but no amount of searching will reveal minerals in which one or more of the scarce metals is an essential constituent.
If neither feldspar is in great excess, neither amphibole nor pyroxene is likely to be an essential constituent; the other minerals will then ordinarily be either biotite or muscovite, or both.
Where the body has been regarded as an essential constituent of personal existence, belief in a significant afterlife has inevitably entailed the idea of the reconstitution of the decomposed corpse and its resurrection to life.
