Cobaltarthurite
A variety of Minerals
What is Cobaltarthurite?
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Cobaltarthurite 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.
Quick Facts
Physical Properties
- Color
- yellowish brown to straw yellow
- Hardness (Mohs)
- 3.5 - 4
- Rock tumbling
- Not recommended
- Density
- 3.22 g/cm³
- Streak
- white to pale brown
Chemical Properties
- Chemical Formula
- (Co,Mg)Fe3+2(AsO4)2(OH)2 · 4H2O
- Elements
- As, Co, Fe, H, O
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Cobaltarthurite FAQs
How do I identify Cobaltarthurite?
Cobaltarthurite can be identified by its hardness of 3.5 - 4 on the Mohs scale, yellowish brown to straw yellow color. Look for these key characteristics when examining specimens.
What color is Cobaltarthurite?
Cobaltarthurite typically appears in yellowish brown to straw yellow. Color can vary depending on impurities and formation conditions.
How hard is Cobaltarthurite?
Cobaltarthurite has a hardness of 3.5 - 4 on the Mohs scale. This gives it moderate hardness.
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