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Tube Agate
Tube Agate is silicate (chalcedony with tube structures), SiO2 (cryptocrystalline). In the hand, it rates 6.5 to 7 on the Mohs scale, and it runs clear and white. Parallel or wandering hollow tubes and pipe structures running through translucent chalcedony, appearing as circles and donuts in cross-section.
The geology.
Tube Agate carries the formula SiO2 (cryptocrystalline). It belongs to the trigonal (cryptocrystalline) system. On paper it is silicate (chalcedony with tube structures).
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.
Parallel or wandering hollow tubes and pipe structures running through translucent chalcedony, appearing as circles and donuts in cross-section.
Expect to see it as cabochons, polished slabs or rough chunks.
The origins.
Agate beds worldwide; well-known material from Oregon and Idaho (USA), Mexico, and Turkey.
On value, the database notes: affordable to mid; clean backlit tube displays bring more.
Traditional associations.
In energy work traditions, associated with keeping energy and ideas flowing through blockages.
Recorded here because it is part of how this material is sold, not because it is a property of the material.
Spotting the real thing.
Parallel or wandering hollow tubes and pipe structures running through translucent chalcedony, appearing as circles and donuts in cross-section.
Not faked; mislabeled as 'wormhole agate' or confused with fossil coral, the tube linings tell the truth.
| Looks like | How to tell them apart |
|---|---|
| Turkish stick agate | Stick agate rods are solid white pseudomorphs; tube agate features are hollow or oxide-lined channels |
| Coral fossil (agatized) | Agatized coral tubes form honeycomb patterns with regular cell walls; tube agate channels are irregular |
| Drilled or wormhole rock | Tube agate channels are mineral-lined and follow flow paths, not bored from the surface |
At-home tests.
None of these need a lab. A 10x loupe, good daylight and a steady hand cover most of what a buyer needs to know about tube agate.
| Test | What you should see |
|---|---|
| Scratch check | Scratches glass (Mohs 6.5 to 7) |
| Under a loupe | Cross-cut tubes show as rings or donuts under a loupe |
| By eye | Backlighting reveals tube paths through the stone |
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 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.
Most damage happens during cleaning, not wearing. Avoid steamers, ultrasonic tanks and anything from under the sink.
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
Agate beds worldwide; well-known material from Oregon and Idaho (USA), Mexico, and Turkey.
What it gets confused with
Turkish stick agate: Stick agate rods are solid white pseudomorphs; tube agate features are hollow or oxide-lined channels. Coral fossil (agatized): Agatized coral tubes form honeycomb patterns with regular cell walls; tube agate channels are irregular. Drilled or wormhole rock: Tube agate channels are mineral-lined and follow flow paths, not bored from the surface.
What it is worth
Affordable to mid; clean backlit tube displays bring more.
Where buyers get caught
Not faked; mislabeled as 'wormhole agate' or confused with fossil coral, the tube linings tell the truth.
One more thing
Tubes record escape paths of fluid or growth lines of needle minerals that dissolved, some still carry an open hollow you can see daylight through.
An education-first guide.
There is nothing to buy on this page. Tube Agate 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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