Lammerite
A variety of Minerals
What is Lammerite?
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 Lammerite 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.
Lammerite Localities Map
See where Lammerite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Dark green
- Hardness (Mohs)
- 3 - 4
- Density
- 5.18 g/cm³
- Streak
- Pale green
Chemical Properties
- Chemical Formula
- Cu3(AsO4)2 a solid solution is suggested basing on the data of Filatov et al. (1984), resulting in Cu3[(AsxP1-x)O4]2 (x=0.23-0.62)
- Elements
- As, Cu, O
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Lammerite FAQs
How do I identify Lammerite?
Lammerite can be identified by its hardness of 3 - 4 on the Mohs scale, Dark green color. Look for these key characteristics when examining specimens.
What color is Lammerite?
Lammerite typically appears in Dark green. Color can vary depending on impurities and formation conditions.
How hard is Lammerite?
Lammerite has a hardness of 3 - 4 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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