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. Streak: pale red with a yellow tone.
- 3Read the lusterHold the specimen under a strong light. Luster: submetallic to metallic.
- 4Match the color rangeCompare against the expected color range: dark red, gray black.
- 5Look at form & habitCrystal system: orthorhombic. Typical habit: microscopic crystals, pyramidal, tabular.
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); streak differs, so Vrbaite leaves pale red with a yellow tone, Realgar leaves red-orange to red; luster reads submetallic to metallic on Vrbaite and resinous to greasy on Realgar.
How to tell apart: Vrbaite is noticeably harder (Mohs 3.5 vs. 1.5-2); luster reads submetallic to metallic on Vrbaite and resinous, pearly on cleavage surface on Orpiment.
How to tell apart: Vrbaite is noticeably harder (Mohs 3.5 vs. 2-2.5); streak differs, so Vrbaite leaves pale red with a yellow tone, Lorándite leaves cherry-red; luster reads submetallic to metallic on Vrbaite and metallic, adamantine on Lorándite.
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
- 5.30 g/cm³
- Colors
- Dark redGray black
- Streak
- Pale red with a yellow tone
- Luster
- Submetallic to metallic
- Transparency
- Opaque
- Crystal system
- Orthorhombic
- Crystal habit
- Microscopic crystals, pyramidal, tabular
- Cleavage
- {010}, good
- Rarity
- Rare
- Uses
- Collector
- Host rock
- In a hydrothermal deposit with other As–Tl sulfide minerals
Where rockhounds find vrbaite
Classic worldwide localities
- Alšar (Allchar), near Rošden, Macedonia
Field-hunting tip
Where it forms: In a hydrothermal deposit with other As–Tl sulfide minerals. If you start seeing realgar, orpiment in float, you are in the right ground. Typical habit: microscopic crystals, pyramidal, tabular. Train your eye for that shape before scanning the outcrop.
Common questions
How do you identify vrbaite?+
Where is vrbaite found?+
Is vrbaite safe to handle?+
What rocks look like vrbaite?+
What minerals are found with vrbaite?+
What kind of rock does vrbaite form in?+
What is vrbaite used for?+
Find vrbaite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
