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 — 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 — 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 — that is 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?+
Where is chalconatronite found?+
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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