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Analcime
Analcime is zeolites (feldspathoid-related), NaAlSi2O6·H2O. In the hand, it rates 5 to 5.5 on the Mohs scale, and it runs colorless and white. Glassy ball-like crystals built of diamond-shaped faces (trapezohedra) lining volcanic gas pockets, like garnet's shape wearing quartz's clear-white colors.
The geology.
Analcime carries the formula NaAlSi2O6·H2O. It belongs to the cubic (commonly trapezohedral) system. Its listing category is zeolites (feldspathoid-related).
It sits at 5 to 5.5 on the Mohs scale. The surface reads vitreous. Light behaviour is transparent to translucent. Specific gravity runs 2.24 to 2.29. The streak is white. It breaks with very poor cleavage; uneven to conchoidal fracture.
Glassy ball-like crystals built of diamond-shaped faces (trapezohedra) lining volcanic gas pockets, like garnet's shape wearing quartz's clear-white colors.
It turns up mostly as sharp trapezohedral crystals in basalt pockets, crystal linings in cavities or granular masses.
The origins.
Cavities in basalt and related volcanic rocks, Nova Scotia, Iceland, Mont Saint-Hilaire (Canada), and the Deccan Traps of India.
On value, the database notes: affordable; sharp glassy crystals modestly collectible.
Traditional associations.
In energy work traditions, analcime is said to support group harmony and gentle emotional clearing.
This is lore, and we label it as lore. The measurable facts are further up the page.
Spotting the real thing.
Glassy ball-like crystals built of diamond-shaped faces (trapezohedra) lining volcanic gas pockets, like garnet's shape wearing quartz's clear-white colors.
Not faked; mislabeled as garnet or leucite at swap meets, the pale color and featherweight heft sort it out.
| Looks like | How to tell them apart |
|---|---|
| Garnet | Same trapezohedral habit but garnet is deep-colored, harder (6.5 to 7.5), and far heavier |
| Leucite | Nearly identical form; leucite sits embedded in lava matrix rather than perched in open pockets |
| Apophyllite | Apophyllite forms square-edged pseudo-cubes with pearly flash on cleavage |
At-home tests.
A loupe and a window seat settle most questions about analcime. No workshop required.
| Test | What you should see |
|---|---|
| By weight | Trapezohedral faces + light weight + pale color = analcime |
| Hardness ~5 | a knife just scratches it |
| By eye | Often perched with other zeolites (stilbite, natrolite) in 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 very poor cleavage; uneven to 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 NaAlSi2O6·H2O. Crystal system: Cubic (commonly trapezohedral). Specific gravity: 2.24 to 2.29. Streak: White. Cleavage and fracture: Very poor cleavage; uneven to conchoidal fracture.
How it reaches the market
Cavities in basalt and related volcanic rocks, Nova Scotia, Iceland, Mont Saint-Hilaire (Canada), and the Deccan Traps of India.
What it gets confused with
Garnet: Same trapezohedral habit but garnet is deep-colored, harder (6.5 to 7.5), and far heavier. Leucite: Nearly identical form; leucite sits embedded in lava matrix rather than perched in open pockets. Apophyllite: Apophyllite forms square-edged pseudo-cubes with pearly flash on cleavage.
What it is worth
Affordable; sharp glassy crystals modestly collectible.
Where buyers get caught
Not faked; mislabeled as garnet or leucite at swap meets, the pale color and featherweight heft sort it out.
One more thing
Its name comes from Greek 'analkimos', 'weak', because rubbing the crystal raises only a feeble static charge, one of mineralogy's more underwhelming superpowers.
An education-first guide.
We do not carry analcime. 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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