Argentopyrite is a rare silver iron sulfide that typically forms thin, tabular, pseudo-hexagonal crystals often found intergrown with sternbergite. It is primarily identified by its distinct metallic luster and association with other silver-bearing sulfides in hydrothermal vein deposits. Due to its scarcity and similarity to other silver minerals, it is highly sought after by advanced systematic collectors.
Is this argentopyrite?
5-step field checkRun through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.
- 1Test the hardnessTry to scratch argentopyrite with a known reference. Argentopyrite sits at Mohs 3.5 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Argentopyrite leaves a black streak.
- 3Read the lusterHold the specimen under a strong light. Argentopyrite typically shows a metallic luster.
- 4Match the color rangeCompare against the expected color range: silver-white, grayish-black.
- 5Look at form & habitCrystal system: orthorhombic. Typical habit: tabular crystals, sometimes in pseudo-hexagonal groups or twins.
Often confused with
Argentopyrite vs. its common look-alikes — and how to tell them apart in the field.
How to tell apart: Argentopyrite is noticeably harder (Mohs 3.5 vs. 1-1.5).
How to tell apart: Streak differs — Argentopyrite leaves black, Pyrrhotite leaves dark grey to black.
How to tell apart: Arsenopyrite is the harder of the two (Mohs 5.5-6 vs. 3.5).
Often found alongside argentopyrite
Minerals reported to co-occur with argentopyrite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- AgFe₂S₃
- Mohs hardness
- 3.5
- Density
- 6.2 g/cm³
- Streak
- Black
- Luster
- Metallic
- Transparency
- Opaque
- Crystal system
- Orthorhombic
- Crystal habit
- Tabular Crystals, Sometimes in Pseudo-hexagonal Groups or Twins
- Cleavage
- Distinct On {001}
- Rarity
- Rare
- Uses
- Collector, Scientific Study
- Host rock
- Hydrothermal Veins
- Typical price
- $50-500 depending on specimen size and provenance
Where rockhounds find argentopyrite
Classic worldwide localities
- Freiberg (Saxony, Germany)
- Jachymov (Czech Republic)
- Guanajuato (Mexico)
- Kongsberg (Norway)
Field-hunting tip
Look in hydrothermal veins country — that is the host setting where argentopyrite typically forms. If you start seeing sternbergite, pyrrhotite, acanthite in float, you are in the right ground. Field specimens usually show a tabular crystals, sometimes in pseudo-hexagonal groups or twins habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find argentopyrite on the map
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