Bruneau Jasper
Bruneau Jasper is silicate (porcelain jasper), SiO2 with iron oxide impurities. In the hand, it rates 6.5 to 7 on the Mohs scale, and it runs chocolate brown and cream. Smooth porcelain-textured jasper with bold concentric egg and orb patterns in chocolate brown and cream, taking a glassy flawless polish.
The geology.
Bruneau Jasper carries the formula SiO2 with iron oxide impurities. It belongs to the trigonal (cryptocrystalline) system. Its listing category is silicate (porcelain jasper).
It sits at 6.5 to 7 on the Mohs scale. The surface reads vitreous, porcelain-like on polish. Light behaviour is opaque. Specific gravity runs 2.58 to 2.91. The streak is white. It breaks with conchoidal fracture.
Smooth porcelain-textured jasper with bold concentric egg and orb patterns in chocolate brown and cream, taking a glassy flawless polish.
It turns up mostly as cabochons, polished slabs or rough.
The origins.
Bruneau Canyon, Owyhee County, Idaho, USA; dug from rhyolite flows in the canyon walls.
On value, the database notes: high among jaspers; old-stock patterned rough is collector material.
Traditional associations.
In energy work traditions, associated with grounded calm and steady self-possession.
This is lore, and we label it as lore. The measurable facts are further up the page.
Spotting the real thing.
Smooth porcelain-textured jasper with bold concentric egg and orb patterns in chocolate brown and cream, taking a glassy flawless polish.
Name gets borrowed for any brown orb jasper; true Bruneau has the porcelain finish and Idaho pedigree.
| Looks like | How to tell them apart |
|---|---|
| Willow Creek jasper | Willow Creek runs softer pastel pinks and grays; Bruneau is brown-and-cream with stronger contrast |
| Royal imperial jasper | Imperial shows smaller egg patterns in greens and pinks; Bruneau orbs are larger and brown-toned |
| Picture jasper | Picture jasper makes landscape scenes with porous patches; Bruneau is tight porcelain with concentric rings |
At-home tests.
A loupe and a window seat settle most questions about bruneau jasper. No workshop required.
| Test | What you should see |
|---|---|
| Scratch check | Scratches glass (Mohs 6.5 to 7) |
| By eye | Porcelain-smooth polish with no pitting |
| By eye | Concentric brown-cream orbiting patterns |
Stop short of anything that leaves a mark. A gemologist can answer the rest without damaging the stone.
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.
Skip the ultrasonic. Lukewarm water, mild soap and a soft cloth handle routine cleaning without risk.
A deeper look.
Extended detail on composition, sourcing, authentication and market value.
The physical record
The formula on record is SiO2 with iron oxide impurities. Crystal system: Trigonal (cryptocrystalline). Specific gravity: 2.58 to 2.91. Streak: White. Cleavage and fracture: Conchoidal fracture.
How it reaches the market
Bruneau Canyon, Owyhee County, Idaho, USA; dug from rhyolite flows in the canyon walls.
What it gets confused with
Willow Creek jasper: Willow Creek runs softer pastel pinks and grays; Bruneau is brown-and-cream with stronger contrast. Royal imperial jasper: Imperial shows smaller egg patterns in greens and pinks; Bruneau orbs are larger and brown-toned. Picture jasper: Picture jasper makes landscape scenes with porous patches; Bruneau is tight porcelain with concentric rings.
What it is worth
High among jaspers; old-stock patterned rough is collector material.
Where buyers get caught
Name gets borrowed for any brown orb jasper; true Bruneau has the porcelain finish and Idaho pedigree.
One more thing
The classic claims sit in a remote desert canyon reachable by rough track, old-stock Bruneau from the 1970s heyday is traded between cutters like vintage wine.
An education-first guide.
We do not carry bruneau jasper. This page exists because the question comes up and the honest answer is worth writing down, whether or not there is anything here to sell you.
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