Vrbaite is an extremely rare sulfosalt mineral primarily known from the Allchar deposit in North Macedonia. It typically occurs as small, deep red to blackish-red crystals associated with other thallium minerals in hydrothermal ore bodies.
Is this vrbaite?
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 vrbaite with a known reference. Vrbaite 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. Vrbaite leaves a orange-red streak.
- 3Read the lusterHold the specimen under a strong light. Vrbaite typically shows a adamantine luster.
- 4Match the color rangeCompare against the expected color range: dark red, red-black.
- 5Look at form & habitCrystal system: orthorhombic. Typical habit: tabular to equant crystals, massive.
Often confused with
Vrbaite vs. its common look-alikes — and how to tell them apart in the field.
How to tell apart: Vrbaite is noticeably harder (Mohs 3.5 vs. 1.5-2); luster reads adamantine on Vrbaite and resinous on Realgar.
How to tell apart: Vrbaite is noticeably harder (Mohs 3.5 vs. 1.5-2); streak differs — Vrbaite leaves orange-red, Orpiment leaves yellow; luster reads adamantine on Vrbaite and resinous on Orpiment.
How to tell apart: Vrbaite is noticeably harder (Mohs 3.5 vs. 2-2.5); streak differs — Vrbaite leaves orange-red, Lorandite leaves cherry-red; luster reads adamantine on Vrbaite and metallic on Lorandite.
Often found alongside vrbaite
Minerals reported to co-occur with vrbaite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Tl₄Hg₃As₈Sb₂S₂₀
- Mohs hardness
- 3.5
- Density
- 4.6 g/cm³
- Streak
- Orange-red
- Luster
- Adamantine
- Transparency
- Translucent
- Crystal system
- Orthorhombic
- Crystal habit
- Tabular to Equant Crystals, Massive
- Cleavage
- Distinct On {010}
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Hydrothermal Veins in Carbonate Rocks
- Typical price
- $100-500 per specimen depending on size and crystal quality
Where rockhounds find vrbaite
Classic worldwide localities
- Allchar, North Macedonia
Field-hunting tip
Look in hydrothermal veins in carbonate rocks country — that is the host setting where vrbaite typically forms. If you start seeing lorandite, realgar, orpiment in float, you are in the right ground. Field specimens usually show a tabular to equant crystals, massive habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find vrbaite on the map
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