Dantopaite is a rare silver bismuth selenide discovered in the Dantopa deposit of Argentina. It typically occurs as small grains associated with other selenide minerals in hydrothermal environments, requiring microscopic identification techniques to confirm.
Is this dantopaite?
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 dantopaite with a known reference. Dantopaite sits at Mohs 3-3.5 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Dantopaite leaves a black streak.
- 3Read the lusterHold the specimen under a strong light. Dantopaite typically shows a metallic luster.
- 4Match the color rangeCompare against the expected color range: dark gray, black.
- 5Look at form & habitCrystal system: orthorhombic. Typical habit: anhedral grains, irregular masses.
Often confused with
Dantopaite vs. its common look-alikes — and how to tell them apart in the field.
How to tell apart: Streak differs — Dantopaite leaves black, Clausthalite leaves gray-black.
How to tell apart: Streak differs — Dantopaite leaves black, Aikinite leaves lead-gray.
How to tell apart: Dantopaite is noticeably harder (Mohs 3-3.5 vs. 2); streak differs — Dantopaite leaves black, Bismuthinite leaves lead-gray.
Often found alongside dantopaite
Minerals reported to co-occur with dantopaite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Ag₅Bi₄Se₈
- Mohs hardness
- 3-3.5
- Density
- 6.12 g/cm³
- Streak
- Black
- Luster
- Metallic
- Transparency
- Opaque
- Crystal system
- Orthorhombic
- Crystal habit
- Anhedral Grains, Irregular Masses
- Cleavage
- None
- Rarity
- Rare
- Uses
- Collector, Scientific Research
- Host rock
- Hydrothermal Veins
- Typical price
- not available for commercial sale
Where rockhounds find dantopaite
Classic worldwide localities
- Dantopa deposit, Sierra de Umango, Argentina
Field-hunting tip
Look in hydrothermal veins country — that is the host setting where dantopaite typically forms. If you start seeing clausthalite, umangite, klockmannite in float, you are in the right ground. Field specimens usually show a anhedral grains, irregular masses habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find dantopaite on the map
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