| The zircon, hyacinth, jacinth, or jargoon belong to the tetragonal system of crystallization. |
| Reducing iron oxide levels to 0.07 percent will allow the zircon to meet premium grade specifications. |
| The answer is probably related to the size of melt reservoirs and the kinetics of zircon solution and precipitation. |
| Rare earth element distributions in the zircons and garnets strongly suggest that the zircon overgrowths formed in equilibrium with garnet. |
| Although blue corundum, zircon, and tourmaline occur in Colorado, they are not known to produce gems. |
| Various attempts were made to date bulk zircon fractions from a number of granitoid rocks. |
