Agaite is an extremely rare lead copper tellurate mineral first discovered in the Berezovskoye gold deposit in the Ural Mountains. It typically forms small, bright yellow tabular crystals or thin crusts in highly oxidized zones of mineral deposits.
Is this agaite?
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 agaite with a known reference. Agaite 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. Agaite leaves a yellow streak.
- 3Read the lusterHold the specimen under a strong light. Agaite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: yellow, orange-yellow.
- 5Look at form & habitCrystal system: triclinic. Typical habit: tabular crystals, crusts.
Often confused with
Agaite vs. its common look-alikes — and how to tell them apart in the field.
How to tell apart: Emmonsite is the harder of the two (Mohs 5 vs. 3); streak differs — Agaite leaves yellow, Emmonsite leaves pale yellow.
How to tell apart: Agaite is noticeably harder (Mohs 3 vs. 1.5-2); streak differs — Agaite leaves yellow, Maldonite leaves black; luster reads vitreous on Agaite and metallic on Maldonite.
Often found alongside agaite
Minerals reported to co-occur with agaite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Pb₃CuTeO₆(OH)₂
- Mohs hardness
- 3
- Density
- 6.35 g/cm³
- Colors
- Streak
- Yellow
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Triclinic
- Crystal habit
- Tabular Crystals, Crusts
- Cleavage
- None
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Hydrothermal Veins in Oxidized Lead-tellurium Deposits
- Typical price
- $50-500 thumbnail
Where rockhounds find agaite
Classic worldwide localities
- Aga mine, Berezovskoye deposit, Ural Mountains, Russia
Field-hunting tip
Look in hydrothermal veins in oxidized lead-tellurium deposits country — that is the host setting where agaite typically forms. If you start seeing quartz, pyrite, galena in float, you are in the right ground. Field specimens usually show a tabular crystals, crusts habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find agaite on the map
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