An ore or arsenic, Arsenic monosulfide.
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Category: <span>R</span>
A heavy, dense, rare element of the platinum group. Symbol, Rh
Rare mineral and metallic elements such as niobium, yttrium, Lanthanum, cerium, praseodymium, neodymium, samarium, thulium, ytterbium, neodymium, dysprosium, gadolinium, promethium, scandium and lutetium
A fine-grained, extrusive igneous rock, having parallel mineral composition with granite
A shaft or room that has been excavated from the ground upward
A heavy, dense and rare, silvery-white precious metal. Symbol, Re
The heaviest radioactive gas element, symbol, Rn
Land adjacent to a large waterbody, connected in the same watershed
A uranium prospecting technique which detects traces of radon gas
The extent of mineralization by size and value, calculated by sound volumetric procedures