Lava that cools in the conduit of a volcano
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Tag: <span>N</span>
A small loose alluvial mass of near pure gold or platinum metal
A compound, mineral or area that does not contain sufficient quantities of iron to be detected or targeted for iron
Small, round discrete masses of a mineral type, usually found within or displaced from another mineral
A group of metals with high resistance to oxidation and chemical dissolution, including mercury, gold, rhenium and platinum group elements