Gabrielite
A variety of Minerals
What is Gabrielite?
Gabrielite is a rare thallium sulfosalt mineral with a chemical formula of Tl6Ag3Cu6(As,Sb)9S21 or Tl2AgCu2As3S7. It was first reported in 2002 for its occurrence in the Lengenbach quarry, Binntal, Valais, Switzerland, and named after Walter Gabriel (born 1943), a Swiss mineral photographer. This region was transformed during the greenschist-garnet/amphibolite facies of metamorphism. Due to this many rare sulfosalts like gabrielite are found in this part of Switzerland.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Gabrielite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Gabrielite Localities Map
See where Gabrielite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- grey to black
- Hardness (Mohs)
- 1.5 - 2
- Density
- 5.38 g/cm³
- Streak
- blackish red
Chemical Properties
- Chemical Formula
- Tl6Ag3Cu6(As,Sb)9S21
- Elements
- Ag, As, Cu, S, Tl
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Gabrielite FAQs
How do I identify Gabrielite?
Gabrielite can be identified by its hardness of 1.5 - 2 on the Mohs scale, grey to black color. Look for these key characteristics when examining specimens.
What color is Gabrielite?
Gabrielite typically appears in grey to black. Color can vary depending on impurities and formation conditions.
How hard is Gabrielite?
Gabrielite has a hardness of 1.5 - 2 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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