Rollandite
A variety of Minerals
What is Rollandite?
Copper arsenate (Cu3(AsO4)2·4H2O, or Cu5H2(AsO4)4·2H2O), also called copper orthoarsenate, tricopper arsenate, cupric arsenate, or tricopper orthoarsenate, is a blue or bluish-green powder insoluble in water and alcohol and soluble in aqueous ammonium and dilute acids. Its CAS number is 7778-41-8 or 10103-61-4.
Uses & Applications
Copper arsenate is an insecticide used in agriculture. It is also used as a herbicide, fungicide, and a rodenticide. It is also used as a poison in slug baits. Copper arsenate can also be a misnomer for copper arsenite, especially when meant as a pigment.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Rollandite 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.
Rollandite Localities Map
See where Rollandite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Glass-green
- Hardness (Mohs)
- 4 - 4.5
- Density
- 3.8 g/cm³
- Streak
- Very light green
Chemical Properties
- Chemical Formula
- Cu3(AsO4)2 · 4H2O
- Elements
- As, Cu, H, O
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Rollandite FAQs
How do I identify Rollandite?
Rollandite can be identified by its hardness of 4 - 4.5 on the Mohs scale, Glass-green color. Look for these key characteristics when examining specimens.
What color is Rollandite?
Rollandite typically appears in Glass-green. Color can vary depending on impurities and formation conditions.
How hard is Rollandite?
Rollandite has a hardness of 4 - 4.5 on the Mohs scale. This gives it moderate hardness.
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