Arsenopyrite
A variety of Arsenopyrite Group
What is Arsenopyrite?
As the name might hint, arsenopyrite is jam-packed with arsenic, more so than any other mineral. It is widespread and has relatively toxic properties to humans. When heated, arsenopyrite can release toxic fumes that can cause severe poisoning. Even when cool, it is strongly urged to use extreme caution when handling this mineral!
Etymology & Origins
Arsenopyrite in older literature may be referred to as mispickel, a name of German origin.
Uses & Applications
Arsenopyrite contains arsenic that is used in pesticides, herbicides, and chemical weapons. As a primary ore of arsenic, it was historically used to harden lead ammunition. It has been used for color in fireworks, glass, and paints.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Arsenopyrite 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.
Arsenopyrite Localities Map
See where Arsenopyrite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Health & Safety Information
- ⚠️Arsenopyrite dust is toxic because it contains heavy metals Arsenic.
- ⚠️When arsenopyrite is heated, it produces poisonous sulfur and arsenic fumes which can be fatal if inhaled in large quantities. With 46% arsenic content, arsenopyrite, along with orpiment, is a principal ore of arsenic.
- ⚠️Arsenic
- ⚠️It's advisable to handle arsenopyrite carefully to avoid generating dust and wash hands thoroughly afterward. When cutting or polishing arsenopyrite, wear a dust mask to prevent inhaling heavy metal particles. Store arsenopyrite in a sealed container in a well-ventilated area, away from children and pets. For those involved in crystal healing, never put it in your mouth.
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Quick Facts
Physical Properties
- Color
- Silver-white to steel-gray, may slight yellow appearance
- Hardness (Mohs)
- 5.5 - 6
- Density
- 6.18 g/cm³
- Streak
- Gray-black
- Luster
- Metallic, Sub-metallic
- Crystal System
- Monoclinic
Chemical Properties
- Chemical Formula
- FeAsS
- Elements
- As, Fe, S
Also Known As
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Arsenopyrite FAQs
How do I identify Arsenopyrite?
Arsenopyrite can be identified by its hardness of 5.5 - 6 on the Mohs scale, Silver-white to steel-gray color, Metallic, Sub-metallic luster, Monoclinic crystal system. Look for these key characteristics when examining specimens.
What color is Arsenopyrite?
Arsenopyrite typically appears in Silver-white to steel-gray, may slight yellow appearance. Color can vary depending on impurities and formation conditions.
How hard is Arsenopyrite?
Arsenopyrite has a hardness of 5.5 - 6 on the Mohs scale. This gives it moderate hardness.
