Garnet
Videos
Garnets are a group of silicate minerals that have been used since the Bronze Age as gemstones and abrasives.
A sample showing the deep red color garnet can exhibit.
Crystal structure of pyrope garnet: White spheres are oxygen; black is silicon; blue is aluminium; and red is magnesium.
Same view, with ion sizes reduced to better show all ions
Yttrium aluminium garnet
Videos
Yttrium aluminium garnet is a synthetic crystalline material of the garnet group. It is a cubic yttrium aluminium oxide phase, with other examples being YAlO3 in a hexagonal or an orthorhombic, perovs
Nd:YAG laser rod 0.5 cm in diameter.