Obradovicite-KCu is a rare arsenate mineral that forms as a secondary product in the oxidation zones of copper-arsenic deposits. It typically presents as small yellow platy crystals or fine-grained crusts and is best identified through chemical analysis or its specific paragenesis.
Is this obradovicite-kcu?
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 obradovicite-kcu with a known reference. Obradovicite-KCu sits at Mohs 2-3 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Obradovicite-KCu leaves a yellow streak.
- 3Read the lusterHold the specimen under a strong light. Obradovicite-KCu typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: yellow, greenish-yellow.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: platy crystals, crusts, pulverulent.
Often confused with
Obradovicite-KCu vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside obradovicite-kcu
Minerals reported to co-occur with obradovicite-kcu. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- KCuFe₂(AsO₄)₂(OH)₂·2H₂O
- Mohs hardness
- 2-3
- Density
- 3.5-3.8 g/cm³
- Colors
- Streak
- Yellow
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Monoclinic
- Crystal habit
- Platy Crystals, Crusts, Pulverulent
- Cleavage
- None
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Oxidized Hydrothermal Copper-arsenic Deposits
- Typical price
- $50-300 per specimen
Where rockhounds find obradovicite-kcu
Classic worldwide localities
- Chuquicamata, Chile
- Jáchymov, Czech Republic
Field-hunting tip
Look in oxidized hydrothermal copper-arsenic deposits country — that is the host setting where obradovicite-kcu typically forms. If you start seeing jarosite, brochantite, atacamite in float, you are in the right ground. Field specimens usually show a platy crystals, crusts, pulverulent habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find obradovicite-kcu on the map
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