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Thomsonite
Thomsonite is zeolites, NaCa2Al5Si5O20·6H2O. In the hand, it rates 5 to 5.5 on the Mohs scale, and it runs white and peach-pink. Beach-pebble nodules that polish into hypnotic concentric 'eyes' of pink, cream, and green, radiating zeolite fibers grown in rings inside ancient lava bubbles.
The geology.
Thomsonite carries the formula NaCa2Al5Si5O20·6H2O. It belongs to the orthorhombic system. It is classified as zeolites.
It sits at 5 to 5.5 on the Mohs scale. The surface reads vitreous to pearly, silky in fibers. Light behaviour is translucent to opaque. Specific gravity runs 2.3 to 2.4. The streak is white. It breaks with perfect cleavage one direction; uneven fracture.
Beach-pebble nodules that polish into hypnotic concentric 'eyes' of pink, cream, and green, radiating zeolite fibers grown in rings inside ancient lava bubbles.
You will most often meet it as radiating nodules with concentric 'eyes', beach pebbles, cabochons or sprays in basalt vesicles.
The origins.
Amygdules in basalt, the Lake Superior shore at Grand Marais, Minnesota is the storied locality; also Scotland, Faroe Islands, India.
On value, the database notes: affordable rough; fine green-eyed Minnesota gem nodules are genuinely scarce and prized.
Traditional associations.
In energy work traditions, thomsonite is considered a stone of clearing entanglements and sharpening focus.
People buy on this language, so it belongs on the page. It belongs under the facts, though, not over them.
Spotting the real thing.
Beach-pebble nodules that polish into hypnotic concentric 'eyes' of pink, cream, and green, radiating zeolite fibers grown in rings inside ancient lava bubbles.
Rarely faked; tumbled agate or dyed stones are sometimes mislabeled 'thomsonite', no ringed fiber eyes, no sale.
| Looks like | How to tell them apart |
|---|---|
| Agate (Lake Superior) | Agate is glassy-hard quartz (7) with translucent bands; thomsonite is softer with silky fibrous rings |
| Prehnite | Prehnite is glassier green without crisp ringed eyes |
| Mesolite/natrolite sprays | Those form open needle sprays, not tight polished-able nodules |
At-home tests.
You can run every one of these at a kitchen table. Good light matters more than gear when you are looking at thomsonite.
| Test | What you should see |
|---|---|
| Scratch check | Knife scratches it (agate it is not) |
| By eye | Concentric ringed eyes with radiating fiber sheen |
| By eye | Found in or weathered from basalt |
Stop short of anything that leaves a mark. A gemologist can answer the rest without damaging the stone.
Care & handling.
At 5 to 5.5 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 perfect cleavage one direction; uneven 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 NaCa2Al5Si5O20·6H2O. Crystal system: Orthorhombic. Specific gravity: 2.3 to 2.4. Streak: White. Cleavage and fracture: Perfect cleavage one direction; uneven fracture.
How it reaches the market
Amygdules in basalt, the Lake Superior shore at Grand Marais, Minnesota is the storied locality; also Scotland, Faroe Islands, India.
What it gets confused with
Agate (Lake Superior): Agate is glassy-hard quartz (7) with translucent bands; thomsonite is softer with silky fibrous rings. Prehnite: Prehnite is glassier green without crisp ringed eyes. Mesolite/natrolite sprays: Those form open needle sprays, not tight polished-able nodules.
What it is worth
Affordable rough; fine green-eyed Minnesota gem nodules are genuinely scarce and prized.
Where buyers get caught
Rarely faked; tumbled agate or dyed stones are sometimes mislabeled 'thomsonite', no ringed fiber eyes, no sale.
One more thing
'Thomsonite hunting' is a Minnesota North Shore tradition, the prized green-eyed pebbles wash from one short stretch of 1.1-billion-year-old lava flows, and locals guard their beaches like mushroom spots.
An education-first guide.
We do not carry thomsonite. 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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