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Atomizer

A device producing fine mist for the suppression of airborne dust

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Atom

The smallest particle of an element in the composition of a molecule

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Asteria

Any cut gemstone “en cabochon” that displays a star-like appearance

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Asset

Any item or instrument from which a price or purpose may be assigned

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Assessment work

The amount of work required to be performed, by law, in order to retain possession of mining rights

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Assay

A test performed on a mineral sample to determine its composition

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Ash

The inorganic byproduct of combustion

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Asbestos

A silicate mineral whose thin, strong fibers separate readily. Used in heat resistance. Known for causing terminal respiratory illness

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Arsenic

A steel-gray and brittle metal. Symbol, As. Highly poisonous