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A study led by Zhu Maohttp://link.aps.org/doi/10.1103/PhysRevB.83.054114 (Stanford) suggests that oxide phases formed from earth garnets may have interesting properties at high pressures and are candidates for highly incompressible solids and many industrial applications. GGG is a material with good optical, mechanical, and thermal properties which make it promising for the fabrication of various optical components as well as substrate material for magneto-optical films and high-temperature superconductors [Z. Mao, Phys. Rev. Lett. 83, 054114 (2011)].