Haidingerite
A variety of Minerals
What is Haidingerite?
Haidingerite is a calcium arsenate mineral with formula Ca(AsO3OH)·H2O. It crystallizes in the orthorhombic crystal system as short prismatic to equant crystals. It typically occurs as scaly, botryoidal or fibrous coatings. It is soft, Mohs hardness of 2 to 2.5, and has a specific gravity of 2.95. It has refractive indices of nα = 1.590, nβ = 1.602 and nγ = 1.638. It was originally discovered in 1827 in Jáchymov, Czech Republic. It was named to honor Austrian mineralogist Wilhelm Karl Ritter von Haidinger (1795–1871). It occurs as a dehydration product of pharmacolite in the Getchell Mine, Nevada.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Haidingerite 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
- Colorless, white; colorless in transmitted light.
- Hardness (Mohs)
- 2 - 2.5
- Rock tumbling
- Not recommended
- Density
- 2.971 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- CaHAsO4 · H2O
- Elements
- As, Ca, H, O
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Haidingerite FAQs
How do I identify Haidingerite?
Haidingerite can be identified by its hardness of 2 - 2.5 on the Mohs scale, Colorless color. Look for these key characteristics when examining specimens.
What color is Haidingerite?
Haidingerite typically appears in Colorless, white; colorless in transmitted light.. Color can vary depending on impurities and formation conditions.
How hard is Haidingerite?
Haidingerite has a hardness of 2 - 2.5 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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