Comparison · Minerals
Azurite vs Kyanite
Azurite and Kyanite are easy to confuse because both are minerals. 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. Below is a side-by-side comparison of their properties and the quick tests that separate them.
Key differences between Azurite and Kyanite
- 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.
- Streak color differs: Azurite leaves a light blue streak on unglazed porcelain, Kyanite leaves white.
- They overlap in blue, but Kyanite also comes in green, orange, and black.
- Well-formed crystals give it away: Azurite is monoclinic, Kyanite is triclinic.
Azurite vs Kyanite properties
| Property | Azurite | Kyanite |
|---|---|---|
| Type | Minerals | Minerals |
| Mohs hardness | 3.5 | 5 |
| Luster | vitreous | vitreous |
| Streak | Light blue | White |
| Transparency | translucent | translucent |
| Specific gravity | 3.8 | 3.6 |
| Crystal system | monoclinic | triclinic |
| Common colors | Deep Blue, Azure Blue | Blue, Green, Orange, Black |
| Rarity | uncommon | uncommon |
| Typical specimen value | $10–$500+ | $10–$300+ |
Which is more valuable?
Typical specimens of Azurite and Kyanite trade in a similar range, around $50.
About Azurite
Azurite is a deep blue copper carbonate mineral, often found with green malachite. It was ground into pigment for the famous blue in Renaissance paintings.
About Kyanite
Kyanite is a blue silicate mineral unique for having different hardness values depending on the direction of scratch (4-5 lengthwise, 6-7 crosswise).
Azurite vs Kyanite FAQ
Is Azurite the same as Kyanite?
No. Both are minerals, but they are distinct species with different hardness, streak or luster. 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.
How can you tell Azurite from Kyanite?
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. Streak color differs: Azurite leaves a light blue streak on unglazed porcelain, Kyanite leaves white. They overlap in blue, but Kyanite also comes in green, orange, and black.
Which is harder, Azurite or Kyanite?
Kyanite is harder: Mohs 5 against Mohs 3.5 for Azurite.
Which is more valuable, Azurite or Kyanite?
Typical specimens of Azurite and Kyanite trade in a similar range, around $50.
