Abstract
The garnet-structured compound Ca 2NaMg 2V 3O 12 is amenable to growth in the laboratory by synthetic contact metamorphism using a solution of V 2O 5 and Na 2SiO 3 in the approximate ratio 4.3:1 acting on dolomite marble “rock.” Cooling a 320 g crucible-charge at −2.6 °C min −1 from a soak temperature of 1020 °C yielded drusy clusters of crystals exhibiting characteristic {2 1 1} and {1 1 0} garnet faces, with individual crystals as large as 5 mm. X-ray powder diffraction confirmed a cubic garnet structure with lattice constant=12.42 7 Å. The crystals had a specific gravity of 3.43 g cm −3, refractive index >1.8, and Mohs hardness about 4.
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