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Any notable length of infilled mineralization

Characteristic colour patterns in usually sedimentary rock

A gray to white, ductile, metal. Symbol, V

Benefit minus cost

A naturally occurring red pigment from mercuric sulphide or iron oxide

An opening in the Earth to facilitate the flow of volcanic fluids, gases and materials

A small cavity occurring in rock, through trapped gases and/or internal crystallization

Any material of volcanic origin

A mineral, element or substance easily prone to a change in state

Used to describe minerals with a glassy appearance