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Corundum is a crystalline form of aluminium oxide (Al 2 O 3) typically containing traces of iron, titanium, vanadium, and chromium. [ 3 ] [ 4 ] It is a rock -forming mineral . It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. [ 7 ]
Sapphire (gem corundum of any color except red, especially blue varieties) Sard (a variety of chalcedony/quartz) Satinspar (a variety of gypsum) Selenite (a variety of gypsum) Simetite (a variety of amber) Smoky quartz (a brown or black variety of quartz) Soda niter (synonym of nitratine) Spectrolite (a variety of labradorite) Spessartite ...
Pages in category "Corundum gemstones" The following 7 pages are in this category, out of 7 total. This list may not reflect recent changes. B. Black Star sapphire; G.
Sapphires are a color variety of corundum, a crystalline form of aluminium oxide (Al 2 O 3). [14] Corundum is one of the hardest minerals, rating 9 on the Mohs scale. [15] Corundum gems of most colors are called sapphires, except for red ones, which are called rubies. [16] The term "Yogo sapphire" refers only to sapphires from the Yogo Gulch. [17]
Image credits: Green____cat A constant flow of negative news can additionally influence our social behavior. "Prolonged exposure to negatively valenced news and media can lead to emotional ...
Ringworm. What it looks like: Ringworm is a common skin infection caused by a fungus. It gets its name from its circular rash, which is often red, swollen, and cracked. Other symptoms to note ...
Pages in category "Corundum varieties" The following 2 pages are in this category, out of 2 total. This list may not reflect recent changes. C. Corundum; E. Emery (rock)
Pictures to help you identify and treat them Sometimes, the only sign you have bedbugs will be the itchy, red bites they leave behind. But their bites can also look like many other insect bites.