Polybasite
A variety of Pearceite-polybasite Group
What is Polybasite?
Stumbling across a polybasite is not a common occurrence, so if you're peering upon a piece, you're fortunate! The name polybasite comes from Greek words meaning "many bases" as it is comprised of several different base elements, most of which are metallic. Its crystals are a common formation within veins of silver.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Polybasite 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.
Polybasite Localities Map
See where Polybasite 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
- Black with dark ruby red internal reflections
- Hardness (Mohs)
- 2.5 - 3
- Density
- 6.36 g/cm³
- Streak
- black
- Luster
- Metallic
- Crystal System
- Monoclinic
Chemical Properties
- Chemical Formula
- [(Ag,Cu)6(Sb,As)2S7][Ag<sub>9</sub>CuS<sub>4</sub>]
- Elements
- Ag, As, Cu, S, Sb
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Polybasite FAQs
How do I identify Polybasite?
Polybasite can be identified by its hardness of 2.5 - 3 on the Mohs scale, Black with dark ruby red internal reflections color, Metallic luster, Monoclinic crystal system. Look for these key characteristics when examining specimens.
What color is Polybasite?
Polybasite typically appears in Black with dark ruby red internal reflections. Color can vary depending on impurities and formation conditions.
How hard is Polybasite?
Polybasite has a hardness of 2.5 - 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.