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Molybdenite
Molybdenite is sulfide (molybdenum), MoS₂. In the hand, it rates 1 to 1.5 on the Mohs scale, and it runs blue-silver gray and lead gray. Graphite's heavyweight twin, blue-silver metallic flakes that smear on fingers but weigh twice what graphite does, with a faint violet-blue cast. Porphyry deposits and granites: Climax (Colorado, USA), Australia, China, Norway.
The geology.
Molybdenite carries the formula MoS₂. It belongs to the hexagonal system. On paper it is sulfide (molybdenum).
It sits at 1 to 1.5 on the Mohs scale. The surface reads metallic, bright. Light behaviour is opaque. Specific gravity runs 4.6 to 4.75. The streak is blue-gray (greenish on porcelain). It breaks with perfect basal cleavage; flexible flakes.
Graphite's heavyweight twin, blue-silver metallic flakes that smear on fingers but weigh twice what graphite does, with a faint violet-blue cast.
Expect to see it as hexagonal plates in quartz, foliated masses or flakes.
The origins.
Porphyry deposits and granites: Climax (Colorado, USA), Australia, China, Norway.
On value, the database notes: affordable; sharp hexagonal plates in quartz are collector pieces.
Traditional associations.
In energy work traditions, molybdenite is linked in modern writing with balance and easing rigidity.
Recorded here because it is part of how this material is sold, not because it is a property of the material.
Spotting the real thing.
Graphite's heavyweight twin, blue-silver metallic flakes that smear on fingers but weigh twice what graphite does, with a faint violet-blue cast.
| Looks like | How to tell them apart |
|---|---|
| Graphite | The classic confusion: graphite is featherweight (SG 2.2) and blacker; molybdenite is heavy (4.7) with blue-silver sheen and greenish porcelain streak |
| Galena | Galena breaks into rigid cubes; molybdenite bends in flexible sheets |
| Hematite (specular) | Streaks red-brown and is far harder |
At-home tests.
None of these need a lab. A 10x loupe, good daylight and a steady hand cover most of what a buyer needs to know about molybdenite.
| Test | What you should see |
|---|---|
| By eye | Marks paper like a crayon |
| By weight | Heft test versus graphite (the decider) |
| By eye | Flexible cleavage flakes |
| By eye | Greenish streak line on glazed porcelain |
Destructive tests belong to a gemologist, not a kitchen table. If a piece matters to you, pay for an appraisal before you take a file to it.
Care & handling.
At 1 to 1.5 on the Mohs scale this is a soft material. Keep it as a display piece, store it apart from harder stones, and skip daily-wear settings.
It breaks with perfect basal cleavage; flexible flakes, which is worth knowing before you set it or drop it.
Clean it by hand, dry it properly, and keep it away from ultrasonic cleaners and hot steam.
A deeper look.
Extended detail on composition, sourcing, authentication and market value.
The physical record
The formula on record is MoS₂. Crystal system: Hexagonal. Specific gravity: 4.6 to 4.75. Streak: Blue-gray (greenish on porcelain). Cleavage and fracture: Perfect basal cleavage; flexible flakes.
How it reaches the market
Porphyry deposits and granites: Climax (Colorado, USA), Australia, China, Norway.
What it gets confused with
Graphite: The classic confusion: graphite is featherweight (SG 2.2) and blacker; molybdenite is heavy (4.7) with blue-silver sheen and greenish porcelain streak. Galena: Galena breaks into rigid cubes; molybdenite bends in flexible sheets. Hematite (specular): Streaks red-brown and is far harder.
What it is worth
Affordable; sharp hexagonal plates in quartz are collector pieces.
One more thing
Molybdenite is a natural solid lubricant, the same MoS₂ in aerospace grease, and a single-molecule-thick electronics darling in labs today.
An education-first guide.
We do not stock molybdenite. Writing it up regardless is the point of a reference library.
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