Rayite is an exceptionally rare lead-silver-thallium sulfosalt mineral found almost exclusively in the unique Allchar deposit in North Macedonia. It typically appears as dark, metallic masses associated with other rare thallium-bearing minerals and arsenic sulfides like realgar and orpiment.
Is this rayite?
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 rayite with a known reference. Rayite sits at Mohs 3, softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Rayite leaves a black streak.
- 3Read the lusterHold the specimen under a strong light. Rayite typically shows a metallic luster.
- 4Match the color rangeCompare against the expected color range: dark gray, lead-gray, black.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: massive, anhedral grains.
Often confused with
Rayite vs. its common look-alikes, and how to tell them apart in the field.
How to tell apart: Streak differs, so Rayite leaves black, Galena leaves lead-gray.
How to tell apart: Streak differs, so Rayite leaves black, Jamesonite leaves gray-black.
How to tell apart: Streak differs, so Rayite leaves black, Bournonite leaves steel-gray.
Often found alongside rayite
Minerals reported to co-occur with rayite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Pb₈Ag₂Tl₂Sb₈S₂₁
- Mohs hardness
- 3
- Density
- 5.68 g/cm³
- Streak
- Black
- Luster
- Metallic
- Transparency
- Opaque
- Crystal system
- Monoclinic
- Crystal habit
- Massive, Anhedral Grains
- Cleavage
- Poor
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Hydrothermal Mineral Deposits
- Typical price
- $100-500 thumbnail size
Where rockhounds find rayite
Classic worldwide localities
- Allchar deposit, North Macedonia
Field-hunting tip
Look in hydrothermal mineral deposits country, the host setting where rayite typically forms. If you start seeing lorandite, realgar, orpiment in float, you are in the right ground. Field specimens usually show a massive, anhedral grains habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find rayite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
