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Dryhead Agate
Dryhead Agate is silicate (chalcedony), SiO2 (cryptocrystalline). In the hand, it rates 6.5 to 7 on the Mohs scale, and it runs peach and apricot orange. Concentric fortification banding in warm peach, apricot, and cream tones inside a drab gray siltstone-coated nodule. Dryhead area near the Bighorn Canyon, Carbon County, Montana, USA; dug from hard sedimentary ledges.
The geology.
Dryhead Agate carries the formula SiO2 (cryptocrystalline). It belongs to the trigonal (cryptocrystalline) system. Its listing category is silicate (chalcedony).
It sits at 6.5 to 7 on the Mohs scale. The surface reads waxy to vitreous on polish. Light behaviour is translucent. Specific gravity runs 2.58 to 2.64. The streak is white. It breaks with conchoidal fracture.
Concentric fortification banding in warm peach, apricot, and cream tones inside a drab gray siltstone-coated nodule.
It turns up mostly as nodule halves, polished faces or cabochons.
The origins.
Dryhead area near the Bighorn Canyon, Carbon County, Montana, USA; dug from hard sedimentary ledges.
On value, the database notes: mid to high; clean apricot-banded halves are regional collector favorites.
Traditional associations.
In energy work traditions, associated with warmth, comfort, and steady emotional security.
This is lore, and we label it as lore. The measurable facts are further up the page.
Spotting the real thing.
Concentric fortification banding in warm peach, apricot, and cream tones inside a drab gray siltstone-coated nodule.
Genuine Dryhead is limited and locality-specific; orange dyed Brazilian nodules are sometimes mislabeled with the name.
| Looks like | How to tell them apart |
|---|---|
| Laguna agate | Laguna runs hotter reds and lavenders; Dryhead stays in the peach-apricot-cream family |
| Botswana agate | Botswana is gray-pink and usually sold as small tumbles; Dryhead is orange-toned display nodules |
| Dyed orange agate | Dye is uniform across all bands; Dryhead alternates white and orange naturally |
At-home tests.
A loupe and a window seat settle most questions about dryhead agate. No workshop required.
| Test | What you should see |
|---|---|
| Scratch check | Scratches glass (Mohs 6.5 to 7) |
| By eye | Banding visible as concentric fortifications, not parallel stripes |
| By eye | Rough exterior is dull matrix, interior color needs a cut face |
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 (cryptocrystalline). Crystal system: Trigonal (cryptocrystalline). Specific gravity: 2.58 to 2.64. Streak: White. Cleavage and fracture: Conchoidal fracture.
How it reaches the market
Dryhead area near the Bighorn Canyon, Carbon County, Montana, USA; dug from hard sedimentary ledges.
What it gets confused with
Laguna agate: Laguna runs hotter reds and lavenders; Dryhead stays in the peach-apricot-cream family. Botswana agate: Botswana is gray-pink and usually sold as small tumbles; Dryhead is orange-toned display nodules. Dyed orange agate: Dye is uniform across all bands; Dryhead alternates white and orange naturally.
What it is worth
Mid to high; clean apricot-banded halves are regional collector favorites.
Where buyers get caught
Genuine Dryhead is limited and locality-specific; orange dyed Brazilian nodules are sometimes mislabeled with the name.
One more thing
Unusual for a banded agate, Dryhead formed in sedimentary rock rather than volcanic cavities, and the claim area is so remote that supply has always been a trickle.
An education-first guide.
We do not carry dryhead agate. 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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