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Result search of : R
Title Description
 Russian Crystal   

A colorless variety of gypsum.  
 Running Lift   

Light mine pump used in sinking, which can be raised or lowered in shaft as required.  
 Rotational Fault   


A fault on which rotational movement is exhibited; a partial syn. of hinge fault. 
 Rare Earths   


Oxides of a series of 15 metallic elements, from lanthanum (atomic number 57) to lutetium (71), and of two other elements; yttrium (39), and scandium (21). These elements are not esp. rare in the Earth’s crust, but concentrations are. The rare earth metals resemble one another very closely in chemical and physical properties, thus making it most difficult to separate them. The rare earths are constituents of certain minerals, esp. monazite, bastnaesite, and xenotime. 
 Red Earth   


The characteristic soil of most tropical regions. It is leached, red, deep, and clayey.  
 Rupture Strength   


The differential stress that a material sustains at the instant of breaking, or rupture. The term is normally applied when deformation occurs at atmospheric confining pressure and room temperature. 
 Red Clay   A brown to red deep-sea deposit, which usually contains manganese nodules or a film of manganese. It is the finest divided clay suspension that is derived from the land and transported by ocean currents, accumulating far from land and at the greatest depths. It has a high proportion of volcanic material due to lesser dilution of this material owing to slowness of accumulation of the clay portion. The color is believed to be caused by oxidation. Syn: brown clay  
 Radial Dikes   A descriptive term for dikes that radiate outward from a center, commonly a volcanic neck or stock.  
 Radiometric Ore Sorter   A device for separating gangue from uranium-bearing ore, after primary crushing. 
 Ruthenium   A hexagonal mineral, Ru .  
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