Frondelite
A variety of Rockbridgeite Group
What is Frondelite?
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Frondelite 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.
Frondelite Localities Map
See where Frondelite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Dark brown, ocher-yellow, red-brown, greenish black, greenish brown, black; rarely orange
- Hardness (Mohs)
- 4.5
- Density
- 3.35 g/cm³
- Streak
- Green (unoxidized), brown (oxidized)
Chemical Properties
- Chemical Formula
- Mn2+Fe3+4(PO4)3(OH)5
- Elements
- Fe, H, Mn, O, P
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Frondelite FAQs
How do I identify Frondelite?
Frondelite can be identified by its hardness of 4.5 on the Mohs scale, Dark brown color. Look for these key characteristics when examining specimens.
What color is Frondelite?
Frondelite typically appears in Dark brown, ocher-yellow, red-brown, greenish black, greenish brown, black; rarely orange. Color can vary depending on impurities and formation conditions.
How hard is Frondelite?
Frondelite has a hardness of 4.5 on the Mohs scale. This gives it moderate hardness.