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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
  Jersey Fire Clay Brick   A highly siliceous clay brick, semisilica brick.  
  Kaliphite    A mixture of limonite with oxides of manganese and silicates of zinc and lime.
 
  Y Axis   One of the three optic axes (x,y, and z) in a biaxial crystal. The y-axis is the intermediate optic axis, at right angles to the plane containing optic axes x and z. Light vibrating parallel to the y-axis is called the intermediate ray, the y-ray, and the beta -ray. The middle-value index of refraction nbeta in biaxial minerals is the index of the intermediate ray vibrating parallel to the y-axis.  
 A Horizon   Soil zone immediately below surface, from which soluble material and fine-grained particles have been moved downward by water seeping into soil. Varying amounts of organic matter give A horizon color ranging from gray to black. 
 Aa Channel   A narrow, sinuous channel in which a lava river moves downward and away from a central vent or fissure to feed an aa flow. At the end of eruptive activity, the lava river ordinarily drains away, leaving an open channel mostly floored with spinose aa.
 
 Aa Lava   Lava whose surface is covered with random masses of angular jagged blocks. 
 Abandoned Workings   Excavations, either caved or sealed, that are deserted and in which further mining is not intended and open workings that are not ventilated and inspected regularly. Syn: abandoned mine Federal Mine Safety  
 Abbe Jar   
In mineral processing, a porcelain jar used for laboratory batch grinding tests in ceramic ware. 
 Abbe Theory   The visibility of an object under the microscope is directly proportional to the wavelength of light, and inversely to the aperture of lens. 
 ABC System   
A method of seismic surveying by which the effect of irregular weathering thickness may be determined by a simple calculation from reciprocal placement of shotholes and seismometers. The method was originally used to solve refraction problems arising from irregularities in the top of the high-velocity layer.  
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