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, so 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, so 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, 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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