Yttrium aluminium garnet (Ce:YAG) is used as a phosphor in cathode ray tubes and white light-emitting diodes, and as a scintillator. YAG for a period was used in jewelry as a diamond and other gemstone simulant. Colored variants and their doping elements include: green (chromium), blue (cobalt), red (manganese), yellow (titanium), purple (neodymium), pink, and orange. As faceted gems they are valued (as synthetics) for their clarity, durability, high refractive index and dispersion. The critical angle of YAG is 33 degrees. YAG cuts like natural garnet, with polishing being performed with alumina or diamond (50,000 or 100,000 grit) on common polishing laps. YAG
Garnet Range Garnet Range The Garnet Range, highest point Old Baldy Mountain, elevation , is a mountain range northeast of Drummond, Montana in Powell County, Montana. A popular historic site, Garnet Ghost Town, is in the Garnet Range. Situated on Bureau of Land Management (BLM) land, the ghost town is the remnant of a mining settlement that was inhabited from the late 1800s to the 1930s. The town's population reached several thousand during its peak. A visitor center and self-guided tours are available. Although heavily forested, no portion of the Garnet Range is part of the National Forest system. The BLM owns