Friedelite
A variety of Pyrosmalite Group
What is Friedelite?
Optical Properties
- Refractive Index
- 1.627-1.663
- Birefringence
- 0.032-0.035
- Pleochroism
- None
- Optical Character
- Uniaxial negative
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Friedelite 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.
Friedelite Localities Map
See where Friedelite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Tan, brown, "beef steak" red-brown, dark brown
- Hardness (Mohs)
- 4 - 5
- Streak
- White
Chemical Properties
- Chemical Formula
- Mn2+8Si6O15(OH,Cl)10
- Elements
- Cl, H, Mn, O, Si
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Friedelite FAQs
How do I identify Friedelite?
Friedelite can be identified by its hardness of 4 - 5 on the Mohs scale, Tan color. Look for these key characteristics when examining specimens.
What color is Friedelite?
Friedelite typically appears in Tan, brown, "beef steak" red-brown, dark brown. Color can vary depending on impurities and formation conditions.
How hard is Friedelite?
Friedelite has a hardness of 4 - 5 on the Mohs scale. This gives it moderate hardness.