Almandine
What is Almandine?
Almandine is a species of garnet, a nesosilicate mineral. It is the most common of the gem garnets and is known for its rich red color, often with hints of orange or violet. It is a relatively hard and durable gemstone, making it suitable for various types of jewelry.
Optical Properties
- Refractive Index
- 1.830-1.880
- Birefringence
- None
- Pleochroism
- Weak to absent
- Optical Character
- Isotropic
- Dispersion
- 0.022
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Almandine before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Almandine Localities Map
See where Almandine is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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Quick Facts
Physical Properties
- Color
- Red, reddish-orange, reddish-brown, violet-red
- Hardness (Mohs)
- 7 - 7.5
- Density
- 4.15 - 4.30 g/cm³
- Streak
- White to colorless
Chemical Properties
- Chemical Formula
- (Fe2+3Al2(SiO4)3)
- Elements
- Iron, Aluminum, Silicon, and Oxygen
Also Known As
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Almandine FAQs
How do I identify Almandine?
Almandine can be identified by its hardness of 7 - 7.5 on the Mohs scale, Red color. Look for these key characteristics when examining specimens.
What color is Almandine?
Almandine typically appears in Red, reddish-orange, reddish-brown, violet-red. Color can vary depending on impurities and formation conditions.
How hard is Almandine?
Almandine has a hardness of 7 - 7.5 on the Mohs scale. This makes it a relatively hard mineral suitable for jewelry.