Corundum - Wikipedia
Corundum is a crystalline form of aluminium oxide (Al 2 O 3) typically containing traces of iron, titanium, vanadium and chromium. It is a rock-forming mineral.It is also a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. Corundum has two primary gem varieties, ruby and sapphire.Porcelain Tile vs Ceramic vs Natural Stone | MineralTiles,Porcelain Tiles vs Ceramic vs Natural Stone. What is Porcelain Tile? The grand revolution in the ceramic sector occurred with the conception of Porcelain Tile a material that represents a new trend of the global market. This product brought modern and versatile characteristics by means of the polishing process and the introduction of glazing,Veneer Stone vs. Real Stone for Walls - The Spruce,Veneer Stone: Manufactured veneer stone installs generally the same as natural stone, with lath, a scratch coat, mortar, and grout. The main differences, though, are weight and density. The main differences, though, are weight and density.