Chalconatronite is a secondary copper carbonate mineral that often forms as an alteration product of copper-bearing artifacts or in oxidized zones of copper deposits. It typically appears as pale blue to blue-green radial clusters or delicate crusts and is highly prized by collectors for its rare and distinct crystalline form.
Is this chalconatronite?
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 chalconatronite with a known reference. Chalconatronite sits at Mohs 2.5, softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Chalconatronite leaves a pale blue streak.
- 3Read the lusterHold the specimen under a strong light. Chalconatronite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: blue, blue-green.
- 5Look at form & habitCrystal system: monoclinic. Typical habit: bladed crystals, radial aggregates, crusts.
Often confused with
Chalconatronite vs. its common look-alikes, and how to tell them apart in the field.
How to tell apart: Azurite is the harder of the two (Mohs 3.5-4 vs. 2.5); streak differs, so Chalconatronite leaves pale blue, Azurite leaves light blue; luster reads vitreous on Chalconatronite and vitreous to dull on Azurite.
How to tell apart: Malachite is the harder of the two (Mohs 3.5-4 vs. 2.5); streak differs, so Chalconatronite leaves pale blue, Malachite leaves light green.
Often found alongside chalconatronite
Minerals reported to co-occur with chalconatronite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Na₂Cu(CO₃)₂·3H₂O
- Mohs hardness
- 2.5
- Density
- 2.26 g/cm³
- Colors
- Streak
- Pale Blue
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Monoclinic
- Crystal habit
- Bladed Crystals, Radial Aggregates, Crusts
- Cleavage
- Perfect On {010}
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Oxidized Copper-bearing Ore Deposits and Artifact Alteration Crusts
- Typical price
- $20-150 per specimen depending on size and intensity of color
Where rockhounds find chalconatronite
Classic worldwide localities
- Egypt
- USA
- Italy
- Russia
- Kazakhstan
Field-hunting tip
Look in oxidized copper-bearing ore deposits and artifact alteration crusts country, the host setting where chalconatronite typically forms. If you start seeing malachite, azurite, tenorite in float, you are in the right ground. Field specimens usually show a bladed crystals, radial aggregates, crusts habit, so train your eye for that shape before scanning the outcrop.
Common questions
How do you identify chalconatronite?+
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How much is chalconatronite worth?+
What rocks look like chalconatronite?+
What minerals are found with chalconatronite?+
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Find chalconatronite on the map
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