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Title Description
 Yttrotungstite   


A monoclinic mineral, YW2 O6 (OH)3 . Syn: thorotungstite 
 Yoshimuraite   


A triclinic mineral, (Ba,Sr)2 TiMn2 (SiO4 )2 (PO4 ,SO4 )(OH,Cl) ; forms orange-brown tabular crystals or stellate groups; occurs in an alkali pegmatite at the Noda-Tamagawa Mine, Iwate prefecture, and the Taguchi Mine, Aichi Prefecture, Japan.  
 Yttrium Garnet   


A variety of garnet containing a small amount of yttrium earths. Syn: yttrogarnet 
 Yttrocrasite   


An orthorhombic mineral, (Y,Th,Ca,U)(Ti,Fe)2 (O,OH)6 ; also contains Th, U, Fe; radioactive; black altering to a dull brown coating; in granite pegmatites.  
 Yield Point   


Maximum stress that solid can withstand without undergoing permanent deformation, either by plastic flow or by rupture.  
 Yttrium-aluminum Garnet   


Synthetic; Y3 Al5 O12 ; has useful magnetic properties. Actually not a true garnet and should not be confused with any of the silicate minerals called garnets in the garnet group of minerals. Manufacture of yttrium-aluminum garnets is a commercial use of yttrium. Used in lasers and in microwaves and other electronic applications. Acronym and abbrev., yag.  
 Yield Strength   


The stress at which a material exhibits a specified deviation from proportionality of stress and strain. An offset of 0.2% is used for many metals. See also: yield point 
 Yazoo-type River   

Tributary unable to enter main stream because of natural levees along main stream. Flows along backswamp zone parallel to main stream. 
 Yavapaiite   


A monoclinic mineral, KFe(SO4 )2 ; at the United Verde copper mine, Jerome, AZ. Named for the local Yavapai Native Americans.


 
 Yield Stress    The lowest stress at which extension of a tensile test piece increases without increase in load. It is determined by observing the fall of the testing lever and checked by a pair of dividers on the original gage length. Many materials do not indicate a defined yield stress and in such cases the proof stress is used. See also: working stress; high-tensile steel; mild steel; yield point. Hammond
b. Minimum stress required to shear (that is, exceed elastic recovery) a suspension, such as the dense media used in mineral concentration. 
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