Comparison · Sulfide Minerals vs Minerals
Molybdenite vs Pyrite
Molybdenite and Pyrite are easy to confuse. Pyrite is harder (Mohs 6.5) than Molybdenite (Mohs 1.25), so Pyrite will scratch Molybdenite and not the other way round. A fingernail (Mohs 2.5) scratches it easily. Below is a side-by-side comparison of their properties and the quick tests that separate them.
Key differences between Molybdenite and Pyrite
- Pyrite is harder (Mohs 6.5) than Molybdenite (Mohs 1.25), so Pyrite will scratch Molybdenite and not the other way round. A fingernail (Mohs 2.5) scratches it easily.
- Streak color differs: Molybdenite leaves a bluish gray streak on unglazed porcelain, Pyrite leaves greenish-black.
- Both look metallic, so compare color, tarnish and weight rather than shine.
- Well-formed crystals give it away: Molybdenite is hexagonal, Pyrite is cubic.
Molybdenite vs Pyrite properties
| Property | Molybdenite | Pyrite |
|---|---|---|
| Type | Sulfide Minerals | Minerals |
| Mohs hardness | 1.25 | 6.5 |
| Luster | metallic | metallic |
| Streak | Bluish gray | Greenish-black |
| Transparency | opaque | opaque |
| Specific gravity | 4.7 | 5 |
| Crystal system | hexagonal | cubic |
| Common colors | Lead gray, Bluish gray | Brass Yellow, Pale Gold |
| Rarity | uncommon | common |
| Typical specimen value | $8–$250+ | $2–$100+ |
Which is more valuable?
Molybdenite is usually the more valuable of the two: a typical collector specimen runs about $45 against $15 for Pyrite, and premium Molybdenite can reach $250 or more.
About Molybdenite
Molybdenite is a soft, metallic molybdenum sulfide and the most important ore of molybdenum. It appears as bluish lead-gray flakes, plates, and foliated masses that feel greasy and leave a mark like graphite.
About Pyrite
Pyrite, commonly known as 'fool's gold,' is an iron sulfide with a metallic luster and pale brass-yellow color. Despite its name, it has significant industrial uses.
Molybdenite vs Pyrite FAQ
Is Molybdenite the same as Pyrite?
No. Molybdenite is a sulfide mineral while Pyrite is a mineral. Pyrite is harder (Mohs 6.5) than Molybdenite (Mohs 1.25), so Pyrite will scratch Molybdenite and not the other way round. A fingernail (Mohs 2.5) scratches it easily.
How can you tell Molybdenite from Pyrite?
Pyrite is harder (Mohs 6.5) than Molybdenite (Mohs 1.25), so Pyrite will scratch Molybdenite and not the other way round. A fingernail (Mohs 2.5) scratches it easily. Streak color differs: Molybdenite leaves a bluish gray streak on unglazed porcelain, Pyrite leaves greenish-black. Both look metallic, so compare color, tarnish and weight rather than shine.
Which is harder, Molybdenite or Pyrite?
Pyrite is harder: Mohs 6.5 against Mohs 1.25 for Molybdenite.
Which is more valuable, Molybdenite or Pyrite?
Molybdenite is usually the more valuable of the two: a typical collector specimen runs about $45 against $15 for Pyrite, and premium Molybdenite can reach $250 or more.
