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Millerite
Millerite is sulfide (nickel), NiS. In the hand, it rates 3 to 3.5 on the Mohs scale, and it runs brass yellow and pale gold with iridescent tarnish. Golden needles fine as hair, sprayed in starbursts inside quartz geodes, metallic threads so thin they tremble at a breath.
The geology.
Millerite carries the formula NiS. It belongs to the trigonal system. Its listing category is sulfide (nickel).
It sits at 3 to 3.5 on the Mohs scale. The surface reads metallic, brilliant. Light behaviour is opaque. Specific gravity runs 5.3 to 5.5. The streak is greenish black. It breaks with perfect cleavage; brittle needles.
Golden needles fine as hair, sprayed in starbursts inside quartz geodes, metallic threads so thin they tremble at a breath.
It turns up mostly as hair-fine needle sprays in geodes, radiating tufts or velvet pockets.
The origins.
Carbonate geodes and nickel veins: Halls Gap (Kentucky, USA, the classic), Iowa geodes, Ontario (Canada), Germany.
On value, the database notes: collector mineral; rich needle-spray geodes are prized.
Traditional associations.
In energy work traditions, millerite has little established lore; some link its golden rays with willpower.
This is lore, and we label it as lore. The measurable facts are further up the page.
Spotting the real thing.
Golden needles fine as hair, sprayed in starbursts inside quartz geodes, metallic threads so thin they tremble at a breath.
| Looks like | How to tell them apart |
|---|---|
| Rutile needles in quartz | Rutile is sealed INSIDE quartz crystal; millerite needles sit loose in open geode pockets |
| Pyrite | Pyrite never forms hair-thin flexible-looking needles |
| Goldstone (glass) | Glitter flecks in glass, not free-standing metal threads |
At-home tests.
A loupe and a window seat settle most questions about millerite. No workshop required.
| Test | What you should see |
|---|---|
| By eye | Hair-needle habit in open cavities |
| By eye | Brass color with greenish-black streak |
| By touch | Needles are brittle, handle specimens as untouchables |
If these checks leave you unsure, that is what appraisers are for. Do not file, heat or soak a piece to find out.
Care & handling.
At 3 to 3.5 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 cleavage; brittle needles, which is worth knowing before you set it or drop it.
Most damage happens during cleaning, not wearing. Avoid steamers, ultrasonic tanks and anything from under the sink.
Nickel sulfide, wash hands after handling; needles can splinter into skin.
A deeper look.
Extended detail on composition, sourcing, authentication and market value.
The physical record
The formula on record is NiS. Crystal system: Trigonal. Specific gravity: 5.3 to 5.5. Streak: Greenish black. Cleavage and fracture: Perfect cleavage; brittle needles.
How it reaches the market
Carbonate geodes and nickel veins: Halls Gap (Kentucky, USA, the classic), Iowa geodes, Ontario (Canada), Germany.
What it gets confused with
Rutile needles in quartz: Rutile is sealed INSIDE quartz crystal; millerite needles sit loose in open geode pockets. Pyrite: Pyrite never forms hair-thin flexible-looking needles. Goldstone (glass): Glitter flecks in glass, not free-standing metal threads.
What it is worth
Collector mineral; rich needle-spray geodes are prized.
One more thing
Halls Gap geodes hide golden millerite fireworks, plain gray balls outside, metallic starbursts within.
An education-first guide.
There is nothing to buy on this page. Millerite is not part of our catalogue, and the guide is here anyway because somebody searching the name deserves a straight answer.
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