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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Title Description
 Magmatic Water   Water contained in or expelled from magma.  
 Demineralization   Water softening by use of zeolites or resins to remove cations. 
 Fan Drift Doors   When there are two fans at a mine it is necessary to install isolation doors for each drift leading to a fan in order to prevent the working fan from drawing air from the outside atmosphere. With modern fan layouts, the fan drift may be 5 m or more square and pass 300 m3 /s of air and sometimes more. Modern fan drift doors can be fixed in any position from fully open to fully closed and can be manipulated by one person from outside the fan drift. Doors of the butterfly type are often used and can be opened manually or by power. See also: main separation door  
 Muscovite   White mica." Nonferromagnesian rock-forming silicate mineral with tetrahedra arranged in sheets. Sometimes called potassic mica.
B.A monoclinic mineral, KAl2 (Si3 Al)O10 (OH,F)2; mica group; pseudohexagonal; perfect basal cleavage; forms large, transparent, strong, electrically and thermally insulating, stable sheets; a common rock-forming mineral in silicic plutonic rocks, mica schists, gneisses, and commercially in pegmatites; also a hydrothermal and weathering product of feldspar and in detrital sediments. Also spelled: moscovite. Syn: isinglass; white mica; potash mica; common mica; Muscovy glass; mirror stone. Sericite is fine-grained muscovite, commonly in connection with hydrothermal alteration, but sericite also includes paragonite and illite. Illite is a common syn. for fine-grained muscovite in clay mineralogy.  
 Esker   Winding ridge of stratified glacial drift, steep-sided, 3 to 15 m high, and from a fraction of a kilometer to over 160 km long. 
 Yellow Lead Oreyellow Lead Ore   wulfenite 
 Xenomorphic-granular   Xenomorphic
 
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