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Free gold

Gold that has been freed from its host rock through agitation by usually natural forces

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Fragment

Any piece of broken rock or mineral particle, larger than a grain

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Fracture

A break or cavity in rock in which mineralized fluids may enter and solidify

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Fossil fuel

Coal, petroleum, or natural gas, rich in hydrocarbons, usually derived from fossilized forests of the Jurassic era

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Fossil

The remains, wholly or partially, of a plant or animal preserved in the earth from the past

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Fusion

When 2 atomic nuclei fuse to create a larger, heavier particle, resulting in the release of energy, also known as nuclear fusion

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Fulgurite

The formation of a rock by its constituent mineral being fused by electrical forces such as lightning

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Friable

A term used to describe rock that can easily crack or disintegrate

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Free milling

The property of ore where metals can be recovered from through a usually simple mechanical means and not a more involved chemical process