Obradovicite-NaNa is a rare arsenate mineral characterized by its vibrant yellow, platy crystals. It typically forms in the hyper-arid oxidized environments of copper mines, appearing as delicate crusts or aggregate clusters.
Is this obradovicite-nana?
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-nana with a known reference. Obradovicite-NaNa 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-NaNa leaves a very pale yellowish green streak.
- 3Read the lusterHold the specimen under a strong light. Obradovicite-NaNa typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: yellowish green.
- 5Look at form & habitCrystal system: orthorhombic. Typical habit: platy crystals, tabular aggregates.
Often confused with
Obradovicite-NaNa vs. its common look-alikes, and how to tell them apart in the field.
How to tell apart: Streak differs, so Obradovicite-NaNa leaves very pale yellowish green, Obradovicite-KCu leaves pale pea-green.
How to tell apart: Gartrellite is the harder of the two (Mohs 4 vs. 2-3); streak differs, so Obradovicite-NaNa leaves very pale yellowish green, Gartrellite leaves bright yellow.
Often found alongside obradovicite-nana
Minerals reported to co-occur with obradovicite-nana. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Na₄CuFe₂(AsO₄)₄(OH)₂·10H₂O
- Mohs hardness
- 2-3
- Density
- 2.63 g/cm³
- Colors
- Streak
- Very Pale Yellowish Green
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Orthorhombic
- Crystal habit
- Platy Crystals, Tabular Aggregates
- Cleavage
- None
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Oxidized Zones of Copper Deposits
Where rockhounds find obradovicite-nana
Classic worldwide localities
- Chuquicamata Mine, Chile
Field-hunting tip
Look in oxidized zones of copper deposits country, the host setting where obradovicite-nana typically forms. If you start seeing kröhnkite, chalcanthite, cuprite in float, you are in the right ground. Field specimens usually show a platy crystals, tabular aggregates habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find obradovicite-nana on the map
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