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Nacre

The hard, smooth and iridescent inner layer of a mollusk shell, a source of calcium carbonate

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Nodule

Small, round discrete masses of a mineral type, usually found within or displaced from another mineral

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Noble metal

A group of metals with high resistance to oxidation and chemical dissolution, including mercury, gold, rhenium and platinum group elements

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Noble gas

A group of inert gases which includes neon, helium, argon, krypton, xenon, and radon

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Neutron

An electrically neutral elementary particle, nearly equal in mass to a proton

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Neritic

Term used to describe a large shallow water body, usually in fossil deposits where mollusk shells are found in some concentration