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Result search of : W
Title Description
 Wall-rock Halo   

A dispersion pattern formed in the rock adjoining mineral deposits where the chemical composition has been modified by the ore-forming fluids. 
 Wairakite   

A monoclinic mineral, CaAl2 Si4 O12 .2H2 O ; zeolite group; pseudocubic; colorless to white; in tuffaceous rocks in geothermal areas.  
 Wurtzite   

A trigonal and hexagonal mineral, (Zn,Fe)S ; dimorphous with sphalerite; resinous; brownish black; forms hemimorphic pyramidal crystals or radiating needles and bundles within lamellar sphalerite.  
 Wet Drilling   

In rock drilling for blasting purposes, injection of water through a hollow drill shank to the bottom of a hole, to allay dust and danger of pneumoconiosis.  
 Wire-line Drilling   

The drilling of boreholes with wire-line core-barrel drill-string equipment. 
 Wave Spectrum   


A concept used to describe the distribution of energy among waves of different period. Wave speed increases with wave length, so distant storms may be detected by the increase of energy in long period waves. Sea is fully developed when all possible wave frequencies possess energies appropriate to the spectrum for the prevailing wind speed. 
 Work Stone   


A plate in the bottom of a blast hearth or ore hearth having a groove down its center for conducting away the molten lead.  
 Wad    An earthy, dark brown to black mineral material consisting chiefly of an impure mixture of manganese oxides and oxyhydroxides with variable amounts of copper, cobalt, and iron oxides and oxyhydroxides and silica plus 10% to 20% adsorbed water. It is commonly soft (soiling hands), but may be hard and compact, and has a low density. Wad results from the decomposition of other manganese minerals and accumulates in marshy areas or other zones of ground-water emission where it is an ore of manganese. 
 White Ore    cerussite 
 White Pyrite    Marcasite; Arsenopyrite 
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