Carey Plume Agate Identification Guide

What Carey Plume Agate Looks Like

Carey Plume Agate is a prized plume agate from the Carey Ranch area of Oregon. It is a translucent chalcedony (microcrystalline quartz) hosting delicate, three-dimensional plume inclusions that resemble feathers, smoke, or coral suspended in the stone.

• Color: plumes are typically red, pink, golden, orange, or black set in a clear-to-milky or pale-blue background.
• Luster: waxy to vitreous.
• Transparency: translucent body so the plumes show through.
• Texture: branching, billowing 3-D mineral growths (often iron/manganese oxides), distinct from flat dendrites.

Step-by-Step Field-ID Checklist

1. Confirm it is chalcedony: waxy luster, conchoidal fracture, no crystal faces, very hard.
2. Backlight the stone: genuine plume agate shows the plumes floating in three dimensions inside translucent chalcedony.
3. Examine the inclusions: look for soft, feathery, billowing forms rooted to a point — not flat tree-like patterns.
4. Hardness test: scratches glass easily (Mohs ~6.5–7).
5. Check for the host material context: Oregon plume agates form in volcanic (rhyolite/tuff) host rock seams and nodules.

Key Diagnostic Tests

• Mohs hardness: about 6.5–7; will scratch glass and steel.
• Streak: white.
• Fracture: conchoidal, with sharp edges.
• Cleavage: none.
• Acid: no reaction (silica, not carbonate) — separates it instantly from any carbonate look-alike.
• Density: ~2.6 g/cm³.

Common Look-Alikes

• Moss agate: inclusions form irregular mossy or web-like masses, not organized feathery plumes anchored to a base.
• Dendritic agate: inclusions are flat, fern- or tree-like manganese dendrites grown along a plane, not 3-D plumes.
• Other Oregon plume agates (e.g., Graveyard Point, Priday): very similar; provenance and plume color/style distinguish them, but all share the same plume structure.
• Glass imitations: show bubbles, swirl, and lack the natural rooted-plume geometry.

Where Carey Plume Agate Is Found

The namesake material comes from the Carey Ranch / central and southeastern Oregon high desert, occurring in seams and nodules within volcanic tuffs and rhyolite. It is a collector and lapidary favorite, often cut into cabochons that frame the plumes.