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Particulate minerals, usually gold

A polished surface of a gemstone or rock

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

The exposed end or start of a mineral body

The initial reconnaissance of geology performed by direct observation

Visual and preliminary classification of rock samples collected on-site, prior to formal geochemical analysis

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

A terms used to describe a substance containing iron

A term that describes light-colored volcanic rocks containing feldspar

A group of common igneous rocks with constituent elements forming minerals that includes microcline, orthoclase, plagioclase and others