# How to identify molybdenite

Canonical page: https://lithomap.app/resources/mineral-identification/molybdenite
Last reviewed: September 17, 2026
Page purpose: Original LithoMap mineral identification reference for field observations, search systems, and language models.
Classification: Molybdenum disulfide · MoS₂

## Summary

Molybdenite is a soft, dense, bluish-silver sulfide with a greasy feel and perfect basal cleavage; its flexible flakes resemble graphite but are substantially heavier and usually lighter in color.

## Quick identification clues

- Bluish silver to lead-gray metallic color
- Mohs hardness about 1 to 1.5
- Greasy feel with flexible, nonelastic flakes
- High density for a soft platy mineral

## Composition and classification

Molybdenite is molybdenum disulfide, MoS₂. Rhenium may substitute in small amounts, but appearance cannot determine trace-element content or ore grade.

## Appearance

Molybdenite forms platy hexagonal crystals, foliated masses, rosettes, and disseminated flakes. Fresh surfaces are metallic bluish gray and may leave a gray to greenish-gray mark.

Thin flakes bend but do not spring back. Oxidation can dull surfaces or produce yellowish secondary molybdenum minerals.

## Identification tests

- Hardness: About 1 to 1.5. Scratched very easily, similar to graphite.
- Streak or mark: Gray to greenish gray. Often lighter and greener than graphite’s black mark.
- Density: High; specific gravity about 4.6 to 5.1. A compact piece feels much heavier than graphite.
- Cleavage and tenacity: Perfect basal cleavage; flexible, nonelastic flakes. Confirms a soft layered mineral but not molybdenite alone.

## Common lookalikes

- Graphite: Darker, much lighter in weight, and commonly leaves a blacker mark.
- Galena: Brittle, cubically cleaved, and lacks flexible platy flakes.
- Biotite: Usually brown to black, elastic in thin sheets, and less metallic.

## Direct side-by-side comparisons

- Graphite vs. molybdenite — https://lithomap.app/resources/mineral-identification/compare/graphite-vs-molybdenite

## Most relevant related guides

- Graphite — https://lithomap.app/resources/mineral-identification/graphite
- Biotite — https://lithomap.app/resources/mineral-identification/biotite
- Galena — https://lithomap.app/resources/mineral-identification/galena
- Apatite — https://lithomap.app/resources/mineral-identification/apatite

## Formation

Molybdenite commonly crystallizes from hydrothermal fluids in porphyry molybdenum and porphyry copper systems, quartz veins, greisens, and skarns.

It may occur with quartz, feldspar, pyrite, chalcopyrite, fluorite, scheelite, and alteration minerals. Sparse flakes do not establish economic grade.

## Occurrence and geologic setting

Molybdenite is widespread in certain granitic hydrothermal systems but is rarely abundant in an ordinary hand sample. Weathering can remove or alter exposed flakes.

Field identification should be confirmed where resource, environmental, or processing decisions depend on it.

## Uses and significance

Molybdenite is the principal source of molybdenum, used in alloy steels, stainless steels, catalysts, pigments, lubricants, and high-temperature applications.

## Field safety and limitations

- Avoid grinding sulfide-bearing material or inhaling dust.
- A few visible flakes do not establish a mineable molybdenum deposit.
- Do not enter adits, trenches, or unstable exploration workings.

## Authoritative sources

- Molybdenum Statistics and Information — U.S. Geological Survey: https://www.usgs.gov/centers/national-minerals-information-center/molybdenum-statistics-and-information
- Minerals and their physical properties — U.S. National Park Service: https://www.nps.gov/subjects/geology/minerals.htm
- Mohs Hardness Scale — U.S. National Park Service: https://www.nps.gov/articles/mohs-hardness-scale.htm
- Natural Gemstones: Mineral Gemstones — U.S. Geological Survey: https://pubs.usgs.gov/gip/gemstones/mineral.html

## Specimen photograph

- Image: https://lithomap.app/_delivery/identification/minerals/molybdenite.webp
- Description: Bluish-silver molybdenite flakes along pale veins in a granite specimen
- Creator: Nessa Eull
- License: CC0 1.0 — https://creativecommons.org/publicdomain/zero/1.0/
- Source record: https://commons.wikimedia.org/wiki/File:Molybdenite_(GeoDIL_number_-_1068).jpg

This reference supports preliminary field identification. It is not a laboratory determination, appraisal, hazard assessment, proof of origin, or statement of land ownership, legal access, or collecting permission.