Lindackerite is a rare copper arsenic sulfate mineral that typically forms as delicate, emerald-green platy crystals or crusts. It is most often found in the oxidation zones of polymetallic mineral deposits, particularly those rich in arsenic. Collectors prize it for its vibrant color, though it is usually only found in microscopic or small crystalline aggregates.
Is this lindackerite?
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 lindackerite with a known reference. Lindackerite sits at Mohs 2 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Lindackerite leaves a pale green streak.
- 3Read the lusterHold the specimen under a strong light. Lindackerite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: emerald-green, apple-green, grass-green.
- 5Look at form & habitCrystal system: triclinic. Typical habit: platy crystals, crusts, radial aggregates.
Often confused with
Lindackerite vs. its common look-alikes — and how to tell them apart in the field.
How to tell apart: Conichalcite is the harder of the two (Mohs 4.5 vs. 2); streak differs — Lindackerite leaves pale green, Conichalcite leaves light green.
How to tell apart: Cornwallite is the harder of the two (Mohs 3.5 vs. 2).
Often found alongside lindackerite
Minerals reported to co-occur with lindackerite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Cu₄H₂(AsO₄)₂(SO₄)·9H₂O
- Mohs hardness
- 2
- Density
- 3.32 g/cm³
- Streak
- Pale Green
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Triclinic
- Crystal habit
- Platy Crystals, Crusts, Radial Aggregates
- Cleavage
- Perfect On {010}
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Oxidized Zones of Arsenic-rich Hydrothermal Deposits
- Typical price
- $20-150 thumbnail
Where rockhounds find lindackerite
Classic worldwide localities
- Jachymov, Czech Republic
- Johanngeorgenstadt, Germany
- Cap Garonne, France
Field-hunting tip
Look in oxidized zones of arsenic-rich hydrothermal deposits country — that is the host setting where lindackerite typically forms. If you start seeing pharmacosiderite, scorodite, brochantite in float, you are in the right ground. Field specimens usually show a platy crystals, crusts, radial aggregates habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find lindackerite on the map
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