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Anthracite

Coal containing a low percentage of volatile matter and having a high percentage of fixed carbon

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Anomaly

A variation from what is expected or normal, occurring outside of any pattern or prediction

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Anode

Metal cast in a shape suitable for refining by electrolytic process

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Annual report

Annual financial statements issued by a corporation to its shareholders pertaining to the activity of the company for that year

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Annealing

Using determined heating and cooling points and times on a substance, material or alloy to achieve a desired increase in hardness or malleability

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Aragonite

An orthorhombic mineral 4[CaCO3]; having acicular, pyramidal, tabular, reniform, columnar, or stalactitic habits; a precipitant formed from hot carbonated water in springs, cavities in basalt, or biologically in shells and pearls (mother of pearl)

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Ankerite

A trigonal mineral of the dolomite group, Ca(Fe,Mg,Mn)(CO3)2