Identification guide · Minerals
How to Identify Azurite
Azurite is usually deep blue and azure blue with a vitreous luster and is translucent. It has a Mohs hardness of 3.5. A steel knife blade (Mohs 5.5) scratches it; a copper coin does not. Its streak is light blue. It is most often confused with Chrysocolla, Kyanite, and Malachite; the tests below separate them.
Azurite identification checklist
| Color | Deep Blue, Azure Blue | Look at a clean, dry surface in daylight. Color zoning, banding or spots are as diagnostic as the hue. |
|---|---|---|
| Luster | Vitreous | Fresh surfaces shine like glass; a dull surface usually means weathering, so chip or wet a corner. |
| Transparency | Translucent | Hold a thin edge up to a bright light and note whether light passes through. |
| Mohs hardness | 3.5 | A steel knife blade (Mohs 5.5) scratches it; a copper coin does not. |
| Streak | Light blue | Drag a corner across unglazed porcelain (the back of a bathroom tile) and check the powder color. |
| Cleavage | Perfect | |
| Fracture | Conchoidal | Broken surfaces show smooth, curved, shell-like scoops. |
| Specific gravity | 3.8 | Heavier than it looks (specific gravity about 3.8). |
| Crystal system | Monoclinic |
Extra tests for Azurite
Acid test. Fizzes in vinegar or dilute hydrochloric acid because of its carbonate content.
Glass check. Azurite shares a glassy luster and conchoidal fracture with man-made glass. Glass sits near Mohs 5.5 and often contains round gas bubbles, so a hardness test and a hand lens separate them.
Azurite look-alikes and how to tell them apart
Azurite is harder (Mohs 3.5) than Chrysocolla (Mohs 2.5), so Azurite will scratch Chrysocolla and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not. Azurite vs Chrysocolla →
Kyanite is harder (Mohs 5) than Azurite (Mohs 3.5), so Kyanite will scratch Azurite and not the other way round. A steel knife blade (Mohs 5.5) scratches it; a copper coin does not. Azurite vs Kyanite →
Both sit near Mohs 3.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Azurite vs Malachite →
Both sit near Mohs 3.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
Field tips
- Check whether the specimen's color and texture match typical Azurite examples.
- Use hardness, streak, luster, grain size, and locality together; no single trait is enough for every specimen.
Azurite identification FAQ
How can you tell if a rock is Azurite?
Check the color (deep blue and azure blue), the vitreous luster, a Mohs hardness of 3.5 and a light blue streak. Photographing it with the StoneSnap app gives a match in seconds.
What is the hardness of Azurite?
Azurite has a Mohs hardness of 3.5. A steel knife blade (Mohs 5.5) scratches it; a copper coin does not.
What is the difference between Azurite and Chrysocolla?
Azurite (Mohs 3.5, vitreous luster) and Chrysocolla (Mohs 2.5, vitreous luster) look alike, but hardness, streak and heft usually separate them. See the full Azurite vs Chrysocolla comparison for a side-by-side table.
Is Azurite worth anything?
Entry-level Azurite specimens sell for around $10, typical collector pieces about $50, and premium examples $500 or more depending on size, quality and locality.
What color is Azurite?
Azurite is most often deep blue and azure blue. Color varies with impurities and locality, so confirm with hardness and luster rather than color alone.
