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Fineness

The proportion of a precious metal’s purity, usually Gold, Silver and Platinum, measured in part per thousand

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Facet

A polished surface of a gemstone or rock

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Fill

Natural or manmade materials used to fill cavities created for the exploration or development of more valuable mineral substances

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Face

The exposed end or start of a mineral body

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Fibrous

Minerals that occur in strings, strands, threads or fibers, such as asbestos

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Ferrous

A terms used to describe a substance containing iron