Comparison · Minerals vs Molybdate Minerals
Crocoite vs Wulfenite
Crocoite and Wulfenite are easy to confuse. Both sit near Mohs 2.5–3, 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 Crocoite and Wulfenite
- Both sit near Mohs 2.5–3, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- Streak color differs: Crocoite leaves a orange-yellow streak on unglazed porcelain, Wulfenite leaves white.
- Wulfenite feels noticeably heavier for its size (specific gravity 6.8 versus 5.9–6.1 for Crocoite).
- Hold a thin edge to the light: Crocoite is Translucent, Wulfenite is transparent.
- They overlap in red and orange, but Wulfenite also comes in yellow and brown.
- Well-formed crystals give it away: Crocoite is Monoclinic, Wulfenite is tetragonal.
Crocoite vs Wulfenite properties
| Property | Crocoite | Wulfenite |
|---|---|---|
| Type | Minerals | Molybdate Minerals |
| Mohs hardness | 2.5–3 | 3 |
| Luster | Adamantine to vitreous/resinous | adamantine |
| Streak | Orange-yellow | White |
| Transparency | Translucent | transparent |
| Specific gravity | 5.9–6.1 | 6.8 |
| Crystal system | Monoclinic | tetragonal |
| Common colors | Bright orange-red, Red | Orange, Yellow, Red, Brown |
| Rarity | common | uncommon |
| Typical specimen value | $2–$150+ | $12–$700+ |
Which is more valuable?
Wulfenite is usually the more valuable of the two: a typical collector specimen runs about $80 against $20 for Crocoite, and premium Wulfenite can reach $700 or more.
About Crocoite
Crocoite is lead chromate, PbCrO4, prized for its vivid orange-red color and slender, elongated prismatic crystals that rank among the most vibrantly colored of any mineral. It forms in the oxidized zones of lead deposits where chromium-bearing solutions interact with lead minerals, a fairly uncommon geochemical pairing. It holds historical significance as the first mineral source of the element chromium, discovered and named in the late 18th century.
About Wulfenite
Wulfenite is a lead molybdate famous for its brilliant orange to yellow tabular crystals. A secondary mineral of oxidized lead deposits, it is a highly popular collector species and a minor ore of molybdenum.
Crocoite vs Wulfenite FAQ
Is Crocoite the same as Wulfenite?
No. Crocoite is a mineral while Wulfenite is a molybdate mineral. Both sit near Mohs 2.5–3, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
How can you tell Crocoite from Wulfenite?
Both sit near Mohs 2.5–3, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Streak color differs: Crocoite leaves a orange-yellow streak on unglazed porcelain, Wulfenite leaves white. Wulfenite feels noticeably heavier for its size (specific gravity 6.8 versus 5.9–6.1 for Crocoite).
Which is harder, Crocoite or Wulfenite?
They are about equally hard, both near Mohs 2.5–3.
Which is more valuable, Crocoite or Wulfenite?
Wulfenite is usually the more valuable of the two: a typical collector specimen runs about $80 against $20 for Crocoite, and premium Wulfenite can reach $700 or more.
