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Plume Agate
Plume Agate is silicate (chalcedony with plume inclusions), SiO₂ + Fe/Mn oxide plumes. In the hand, it rates 6.5 to 7 on the Mohs scale, and it runs clear to amber chalcedony with white, cream, red, or black feather plumes. Chalcedony enclosing three-dimensional feathery plumes, billowing smoke- or bouquet-like growths that float at depth inside the stone.
The geology.
Plume Agate carries the formula SiO₂ + Fe/Mn oxide plumes. It belongs to the trigonal (cryptocrystalline) system. Catalogues list it as silicate (chalcedony with plume inclusions).
It sits at 6.5 to 7 on the Mohs scale. The surface reads waxy. Light behaviour is translucent with opaque plumes. Specific gravity runs 2.58 to 2.64. The streak is white. It breaks with conchoidal fracture.
Chalcedony enclosing three-dimensional feathery plumes, billowing smoke- or bouquet-like growths that float at depth inside the stone.
It reaches buyers as cabochons, slabs, polished freeforms or tumbled.
The origins.
Classic American Southwest material: Graveyard Point (Oregon/Idaho), Texas (Woodward Ranch), Mexico.
On value, the database notes: mid-range; classic-locality plume cabs are collector favorites.
Traditional associations.
In energy work traditions, associated with growth of inspiration and quiet abundance.
We keep this section because people ask. It sits below the geology on purpose, and none of it describes something the stone does.
Spotting the real thing.
Chalcedony enclosing three-dimensional feathery plumes, billowing smoke- or bouquet-like growths that float at depth inside the stone.
| Looks like | How to tell them apart |
|---|---|
| Dendritic agate | Dendrites are flat fern fans; plumes are full 3D billows with depth |
| Moss agate | Moss forms tangled threads, not rising feather columns |
| Flower agate | Flower 'blossoms' are compact poppyseed clusters; plumes trail like smoke |
At-home tests.
Before anyone talks you into a lab report, these are the checks worth doing yourself on plume agate.
| Test | What you should see |
|---|---|
| By eye | Tilt to see plumes shift parallax at depth |
| Scratch check | Scratches glass |
| By eye | Plumes anchored to one wall, billowing inward |
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 6.5 to 7 on the Mohs scale it handles careful wear but scratches against quartz and dust. Store it separately and take rings off before rough work.
It breaks with conchoidal fracture, 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 SiO₂ + Fe/Mn oxide plumes. Crystal system: Trigonal (cryptocrystalline). Specific gravity: 2.58 to 2.64. Streak: White. Cleavage and fracture: Conchoidal fracture.
How it reaches the market
Classic American Southwest material: Graveyard Point (Oregon/Idaho), Texas (Woodward Ranch), Mexico.
What it gets confused with
Dendritic agate: Dendrites are flat fern fans; plumes are full 3D billows with depth. Moss agate: Moss forms tangled threads, not rising feather columns. Flower agate: Flower 'blossoms' are compact poppyseed clusters; plumes trail like smoke.
What it is worth
Mid-range; classic-locality plume cabs are collector favorites.
One more thing
Graveyard Point plume agate grew feather gardens of iron oxide inside silica gel, lapidaries cut windows to 'frame the bouquet'.
An education-first guide.
We do not stock plume agate. Writing it up regardless is the point of a reference library.
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