September Birthstone – Sapphire!
Sapphires are a blue form of the mineral corundum. When corundum is red, it is called a ruby. Corundum is one of the hardest known minerals with a hardness of 9 on the Mohs scale. The gemstone sapphire is usually known for its spectacular blue color, but can also come in many other colors, except for red. Sapphires have a glassy luster which makes them shiny and are are most commonly used for jewelry.
One of the largest sapphires in the world is called the “Logan Sapphire” and is over 422 carats. Many beautiful specimens of sapphire are mined in Myanmar, Madagascar, Kashmire, and Sri Lanka, and Australia. In the United States, sapphires and rubies can be found in the area of Franklin, North Carolina, which is a popular area for mines.
Filed under: Geology / Earth Science, Minerals, Rocks on September 9th, 2009
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