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...; it belongs to the corundum group of minerals in the trigonal crystal system. In the gem world, all colors of gem-grade corundum other than rubies are called sapphires. The main component of sapphire is alu...
...means blue; it belongs to the corundum group of minerals in the trigonal crystal system. In the gem world, all colors of gem-grade corundum other than rubies are called sapphires. The main component of sapph...
... of minerals in the trigonal crystal system. In the gem world, all colors of gem-grade corundum other than rubies are called sapphires. The main component of sapphire is alumina (Al2O3). Corundum contains tr...
... means blue; it belongs to the corundum group of minerals in the trigonal crystal system. In the gem world, all colors of gem-grade corundum other than rubies are called sapphires. The main component of sapp...
... means blue; it belongs to the corundum group of minerals in the trigonal crystal system. In the gem world, all colors of gem-grade corundum other than rubies are called sapphires. The main component of sapp...
... crystal system. In the gem world, all colors of gem-grade corundum other than rubies are called sapphires. The main component of sapphire is alumina (Al2O3). Corundum contains trace elements such as iron (F...
... Spphins, which means blue; it belongs to the corundum group of minerals in the trigonal crystal system. In the gem world, all colors of gem-grade corundum other than rubies are called sapphires. The main co...
... material owing to its high melting point.It occurs naturally in its crystalline polymorphic phase α-Al₂O₃ as the mineral corundum, varieties of which form the precious gemstones ruby and sapphire. 2. Featur...