Comparison · Minerals
Azurite vs Cavansite
Azurite and Cavansite are easy to confuse because both are minerals. Both sit near Mohs 3.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Below is a side-by-side comparison of their properties and the quick tests that separate them.
Key differences between Azurite and Cavansite
- Both sit near Mohs 3.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- Streak color differs: Azurite leaves a light blue streak on unglazed porcelain, Cavansite leaves pale blue.
- Azurite feels noticeably heavier for its size (specific gravity 3.8 versus 2.21–2.31 for Cavansite).
- Hold a thin edge to the light: Azurite is translucent, Cavansite is Transparent to translucent.
- Well-formed crystals give it away: Azurite is monoclinic, Cavansite is Orthorhombic.
Azurite vs Cavansite properties
| Property | Azurite | Cavansite |
|---|---|---|
| Type | Minerals | Minerals |
| Mohs hardness | 3.5 | 3–4 |
| Luster | vitreous | Vitreous |
| Streak | Light blue | Pale blue |
| Transparency | translucent | Transparent to translucent |
| Specific gravity | 3.8 | 2.21–2.31 |
| Crystal system | monoclinic | Orthorhombic |
| Common colors | Deep Blue, Azure Blue | Bright blue, Deep blue |
| Rarity | uncommon | common |
| Typical specimen value | $10–$500+ | $2–$150+ |
Which is more valuable?
Azurite is usually the more valuable of the two: a typical collector specimen runs about $50 against $20 for Cavansite, and premium Azurite can reach $500 or more.
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 Cavansite
Cavansite is a rare hydrous calcium vanadium silicate, Ca(VO)Si4O10 4H2O, notable for an intense, almost electric blue color rarely matched by other minerals. It crystallizes in the orthorhombic system, typically as radiating clusters of thin blades lining cavities in basalt. First described in 1967, it remains one of the few common minerals containing vanadium as an essential structural element.
Azurite vs Cavansite FAQ
Is Azurite the same as Cavansite?
No. Both are minerals, but they are distinct species with different hardness, streak or luster. Both sit near Mohs 3.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
How can you tell Azurite from Cavansite?
Both sit near Mohs 3.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Streak color differs: Azurite leaves a light blue streak on unglazed porcelain, Cavansite leaves pale blue. Azurite feels noticeably heavier for its size (specific gravity 3.8 versus 2.21–2.31 for Cavansite).
Which is harder, Azurite or Cavansite?
They are about equally hard, both near Mohs 3.5.
Which is more valuable, Azurite or Cavansite?
Azurite is usually the more valuable of the two: a typical collector specimen runs about $50 against $20 for Cavansite, and premium Azurite can reach $500 or more.
