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Separating precious metals with a cupel or small clay cup

Cylindrical cross section of rock obtained by drilling

Solidifying magma taking on the crystal structure inherent of its contained minerals

The outer layer of the Earth including continental and oceanic crust

A machine for pulverizing rock or other materials

Unconcentrated, unrefined ore

A refractory cupola used to melt minerals or smelt ore

A main support pillar designed to withstand the bulk of overhead weight

Timbers laid at right angles to each other to create a vertical or horizontal support structure

A wide crack, fissure or opening in rock