Rockbridgeite
A variety of Rockbridgeite Group
What is Rockbridgeite?
Rockbridgeite is a dark green to black colored phosphate mineral with both iron (II) and iron (III) ions. It gets its name in 1949 from the place it discovered: Rockbridge County, Virginia, USA.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Rockbridgeite 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.
Rockbridgeite Localities Map
See where Rockbridgeite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Dark green, olive-green, brown, yellow-brown, greenish black, black
- Hardness (Mohs)
- 3.5 - 4.5
- Density
- 3.6 g/cm³
- Streak
- Gray green, pale brown
- Luster
- Greasy, Resinous, Silky, Waxy, Sub-vitreous
- Crystal System
- Orthorhombic
Chemical Properties
- Chemical Formula
- Fe2+Fe3+4(PO4)3(OH)5
- Elements
- Fe, H, O, P
Also Known As
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Rockbridgeite FAQs
How do I identify Rockbridgeite?
Rockbridgeite can be identified by its hardness of 3.5 - 4.5 on the Mohs scale, Dark green color, Greasy, Resinous, Silky, Waxy, Sub-vitreous luster, Orthorhombic crystal system. Look for these key characteristics when examining specimens.
What color is Rockbridgeite?
Rockbridgeite typically appears in Dark green, olive-green, brown, yellow-brown, greenish black, black. Color can vary depending on impurities and formation conditions.
How hard is Rockbridgeite?
Rockbridgeite has a hardness of 3.5 - 4.5 on the Mohs scale. This gives it moderate hardness.