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Trigonal

A crystal structure having three symmetrical sides, alone or series

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Tephra

Any material deposited by pyroclastic movement

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Trend

The direction of defined mineralization or structure

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Trench

A long, narrow excavation made to expose, access or further define mineralization

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Trap Rock

A type of igneous rock prone to crystallization forming in cavities

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Tram

To haul cars of ore or waste in a mine