Garnets garnet

Ganguly J., Chakraborty S., Sharp T.G., and Rumble D. (1996) Constraint on the time scale of biotite-grade metamorphism during Acadian orogeny from a natural garnet-garnet diffusion couple. Am. Mineral. 81, 1208-1216. 

Figure 5 Covariation of CaO with Ct203 in garnets from a large database (n = 900) from a wide variety of xenoUths in kimberlites and other alkaline rocks. Note the positive correlation of calcium and chromium in peridotite garnets. Garnets below the line are harzbur-gitic, whereas those above it are Iherzolitic or wehrlitic.

The main target of Sm-Nd and Lu-Hf dating in metamorphic studies continues to be the mineral garnet. Garnet is a major constituent in many metamorphic rocks it preferentially incorporates heavy rare earth elements, and hence can have very high (e.g., Stosch andLugmarr, 1987)... 

Discontinuously Y-zoned monazite included in homogeneous or continuously Y-zoned garnet Garnet in equihbrium with outer portion of monazite 2... 

Group III with electronic configuration 5s 4d . The principal ore is gadolinite (a silicate also containing lanthanides). Y2O3 containing Eu is used as a red phosphor in colour television. Yttrium iron garnets are used as microwave filters. 

Yttrium oxide also is used to produce yttrium-iron-garnets, which are very effective microwave filters. 

Gadolinium yttrium garnets are used in microwave applications and gadolinium compounds are used as phosphors in color television sets. 

Structure of (a) alizarin garnet R, and (b) its metal-ligand complex with AP+. 

Neodymium and YAG Lasers. The principle of neodymium and YAG lasers is very similar to that of the ruby laser. Neodymium ions (Nd +) are used in place of Cr + and are often distributed in glass rather than in alumina. The light from the neodymium laser has a wavelength of 1060 nm (1.06 xm) it emits in the infrared region of the electromagnetic spectrum. Yttrium (Y) ions in alumina (A) compose a form of the naturally occurring garnet (G), hence the name, YAG laser. Like the ruby laser, the Nd and YAG lasers operate from three- and four-level excited-state processes. 

Laser action can be induced in Nd ions embedded in a suitable solid matrix. Several matrices, including some special glasses, are suitable but one of the most frequently used is yttrium aluminium garnet (Y3AI5O12), which is referred to as YAG. 

Neodymium-doped yttrium aluminum garnet laser (NldiYAG)... 

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