Minerals with a Mohs Rating of 9: Corundum’s Claim to Fame
We’ll explore corundum, the standout star with a Mohs hardness of 9. This gem is just one notch below diamond, but its properties and uses make it a true powerhouse.
What is Corundum?
Corundum is an aluminum oxide mineral, prized for its incredible hardness and striking beauty. Found in a variety of colors, corundum forms the basis for the precious gemstones sapphire and ruby. Their vibrant hues result from trace elements like iron, titanium, and chromium.
Why Hardness Matters
Hardness, a mineral’s resistance to scratching, is measured on the Mohs scale. Corundum, with its hardness rating of 9, stands just below diamond (rated 10). This makes corundum incredibly durable, suitable for various industrial applications and cherished in jewelry.
The Glamorous Life of Corundum
Gemstones: Sapphire and Ruby
Imagine the allure of a deep blue sapphire or the fiery red of a ruby. These gems are both forms of corundum, admired for their brilliance and durability. They adorn crowns, rings, and necklaces, symbolizing elegance and strength.
Industrial Uses: Cutting and Polishing
Beyond the beauty, corundum is a workhorse in industry. It’s used in cutting, grinding, and polishing applications. Its hardness allows it to shape other materials effortlessly, from metals to glass, making it indispensable in manufacturing.
Fun Facts
Did you know that the name “sapphire” comes from the Greek word “sappheiros,” meaning blue? Or that rubies were once believed to contain the spark of life? Corundum’s story is as colorful as the gemstones it forms.
