Chalcocite has been known to form pseudomorphs of the minerals bornite, covellite, chalcopyrite, pyrite, enargite, millerite, galena and sphalerite.
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Coal, brick clay, and millerite ore were once mined in the city, and the predominant surface rock, the St. Louis Limestone, is used as dimension stone and rubble for construction.
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A yellow mineral consisting of nickel sulfide; a minor source of nickel
Millerite is a nickel sulfide mineral, NiS. It is brassy in colour and has an acicular habit, often forming radiating masses and furry aggregates. It can be distinguished from pentlandite by crystal habit, its duller colour, and general lack of association with pyrite or pyrrhotite.
The Millerites were the followers of the teachings of William Miller who, in 1833, first shared publicly his belief in the coming Second Advent of Jesus Christ in roughly the year 1843.