Corundum (Ruby)
Corundum
Precious Gemstone
What is Corundum (Ruby)?
Ruby is a gemstone variety of the mineral corundum, prized for its vibrant red color. The red hue is primarily due to the presence of chromium. Rubies are known for their hardness, durability, and brilliance, making them ideal for jewelry. They are often associated with passion, love, and vitality.
Optical Properties
- Refractive Index
- 1.762-1.770
- Birefringence
- 0.008
- Pleochroism
- Strong, red to purplish-red
- Optical Character
- Uniaxial (-)
- Dispersion
- 0.018
Corundum (Ruby) Market Value Calculator
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Corundum (Ruby) Localities Map
See where Corundum (Ruby) is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Map preview
North ZoneCentral RidgeSouth Basin
Quick Facts
Physical Properties
- Color
- Red, various shades from pinkish-red to purplish-red
- Hardness (Mohs)
- 9
- Density
- 3.97 - 4.05 g/cm³
- Streak
- Colorless
Chemical Properties
- Chemical Formula
- Al2O3
- Elements
- Aluminum, Oxygen, Chromium, Iron, Titanium, Vanadium
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