Coal used for the generation of electricity through combustion
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Category: <span>T</span>
A heavy, silvery-white metal. Symbol, Tl
A crystal form of four, equilateral triangle faces
A crystal structure having three symmetrical sides, alone or series
The period following the Cretaceous, from 65 to 1.8 million years ago
The period in time from 245 – 208 million years ago
Any material deposited by pyroclastic movement
The direction of defined mineralization or structure
A mineral comprised of tellurium and another element
A long, narrow excavation made to expose, access or further define mineralization