Comparison · Minerals vs Oxide Minerals
Graphite vs Pyrolusite
Graphite and Pyrolusite are easy to confuse. Pyrolusite is harder (Mohs 6.25) than Graphite (Mohs 1–2), so Pyrolusite will scratch Graphite 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 Graphite and Pyrolusite
- Pyrolusite is harder (Mohs 6.25) than Graphite (Mohs 1–2), so Pyrolusite will scratch Graphite and not the other way round. A fingernail (Mohs 2.5) scratches it easily.
- Streak color differs: Graphite leaves a black, shiny gray-black streak on unglazed porcelain, Pyrolusite leaves black to bluish black.
- Both look metallic, so compare color, tarnish and weight rather than shine.
- Pyrolusite feels noticeably heavier for its size (specific gravity 5 versus 2.09–2.23 for Graphite).
- Hold a thin edge to the light: Graphite is Opaque, Pyrolusite is opaque.
- Well-formed crystals give it away: Graphite is Hexagonal, Pyrolusite is tetragonal.
Graphite vs Pyrolusite properties
| Property | Graphite | Pyrolusite |
|---|---|---|
| Type | Minerals | Oxide Minerals |
| Mohs hardness | 1–2 | 6.25 |
| Luster | Metallic to dull/earthy | metallic |
| Streak | Black, shiny gray-black | Black to bluish black |
| Transparency | Opaque | opaque |
| Specific gravity | 2.09–2.23 | 5 |
| Crystal system | Hexagonal | tetragonal |
| Common colors | Black, Steel-gray | Black, Steel gray, Bluish gray |
| Rarity | common | common |
| Typical specimen value | $2–$150+ | $5–$200+ |
Which is more valuable?
Pyrolusite is usually the more valuable of the two: a typical collector specimen runs about $35 against $20 for Graphite, and premium Pyrolusite can reach $200 or more.
About Graphite
Graphite is native carbon, chemically identical to diamond but crystallizing in a completely different structure of stacked hexagonal sheets that slide easily past one another. This layered atomic arrangement gives graphite its softness, greasy feel, and ability to conduct electricity, all properties diamond lacks despite sharing the same element. It forms through the metamorphism of carbon-rich sedimentary rocks or through the crystallization of carbon in igneous and hydrothermal settings.
About Pyrolusite
Pyrolusite is the most common manganese oxide ore mineral, with a steel-gray to black color and metallic to dull luster. It typically occurs as massive, fibrous, or radiating aggregates and often forms branching dendrites on rock surfaces.
Graphite vs Pyrolusite FAQ
Is Graphite the same as Pyrolusite?
No. Graphite is a mineral while Pyrolusite is a oxide mineral. Pyrolusite is harder (Mohs 6.25) than Graphite (Mohs 1–2), so Pyrolusite will scratch Graphite and not the other way round. A fingernail (Mohs 2.5) scratches it easily.
How can you tell Graphite from Pyrolusite?
Pyrolusite is harder (Mohs 6.25) than Graphite (Mohs 1–2), so Pyrolusite will scratch Graphite and not the other way round. A fingernail (Mohs 2.5) scratches it easily. Streak color differs: Graphite leaves a black, shiny gray-black streak on unglazed porcelain, Pyrolusite leaves black to bluish black. Both look metallic, so compare color, tarnish and weight rather than shine.
Which is harder, Graphite or Pyrolusite?
Pyrolusite is harder: Mohs 6.25 against Mohs 1–2 for Graphite.
Which is more valuable, Graphite or Pyrolusite?
Pyrolusite is usually the more valuable of the two: a typical collector specimen runs about $35 against $20 for Graphite, and premium Pyrolusite can reach $200 or more.
