|
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.
|
Home |
Contact Us |
Help
Research Institute
