What are sudden cardiac arrest and sudden cardiac death? Sudden cardiac death (SCD) is a sudden, unexpected death caused by loss of heart function (sudden cardiac arrest). Sudden cardiac death is the largest cause of natural death in the United States, causing about 325,000 adult deaths in the United States each year.
Corundum is a crystalline form of aluminium oxide (Al. 2O. 3) typically containing traces of iron, titanium, vanadium and chromium. It is a rock-forming mineral. It is a naturally transparent material, but can have different colors when impurities are present.
Corundum as ruby, sapphire, and fancy sapphire: Gem-quality corundum is a highly prized and valuable material. When it is bright red in color, it is called ruby.. When it is deep blue, it is called sapphire.. Gem-quality corundum of any other color is called fancy sapphire..