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Natrolite
Natrolite is tectosilicate (zeolite), Na₂Al₂Si₃O₁₀·2H₂O. In the hand, it rates 5 to 5.5 on the Mohs scale, and it runs colorless and snow white. Glassy white needle-sprays radiating in perfect sunbursts inside volcanic pockets, slimmer and sharper than its zeolite cousins. Basalt cavities: India (Maharashtra), New Jersey (USA), Northern Ireland, Russia (Kola gem crystals).
The geology.
Natrolite carries the formula Na₂Al₂Si₃O₁₀·2H₂O. It belongs to the orthorhombic system. Catalogues list it as tectosilicate (zeolite).
It sits at 5 to 5.5 on the Mohs scale. The surface reads vitreous to silky. Light behaviour is transparent to translucent. Specific gravity runs 2.20 to 2.26. The streak is white. It breaks with perfect cleavage; brittle needles.
Glassy white needle-sprays radiating in perfect sunbursts inside volcanic pockets, slimmer and sharper than its zeolite cousins.
It reaches buyers as radiating needle sprays, sunburst balls in basalt or sprays on matrix.
The origins.
Basalt cavities: India (Maharashtra), New Jersey (USA), Northern Ireland, Russia (Kola gem crystals).
On value, the database notes: affordable; pristine sunburst plates are mid-range.
Traditional associations.
In energy work traditions, associated, like its zeolite kin, with calm, rest, and gentle spiritual openness.
We keep this section because people ask. It sits below the geology on purpose, and none of it describes something the stone does.
Spotting the real thing.
Glassy white needle-sprays radiating in perfect sunbursts inside volcanic pockets, slimmer and sharper than its zeolite cousins.
Often confused with scolecite and selenite in shops; the fingernail test rules out selenite (natrolite resists).
| Looks like | How to tell them apart |
|---|---|
| Scolecite | Near-twin, scolecite's needles are typically stouter and it's the calcium sibling; localities and labs separate them |
| Mesolite | Even finer cotton-fine needles, intermediate chemistry, same family puzzle |
| Aragonite (acicular) | Aragonite fizzes in vinegar; natrolite doesn't |
At-home tests.
Before anyone talks you into a lab report, these are the checks worth doing yourself on natrolite.
| Test | What you should see |
|---|---|
| Acid check | No fizz |
| By eye | Radiating needle sunbursts |
| By eye | Light in hand (SG ~2.2); needles pierce, handle carefully |
Destructive tests belong to a gemologist, not a kitchen table. If a piece matters to you, pay for an appraisal before you take a file to it.
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; brittle needles, which is worth knowing before you set it or drop it.
Clean it by hand, dry it properly, and keep it away from ultrasonic cleaners and hot steam.
A deeper look.
Extended detail on composition, sourcing, authentication and market value.
The physical record
The formula on record is Na₂Al₂Si₃O₁₀·2H₂O. Crystal system: Orthorhombic. Specific gravity: 2.20 to 2.26. Streak: White. Cleavage and fracture: Perfect cleavage; brittle needles.
How it reaches the market
Basalt cavities: India (Maharashtra), New Jersey (USA), Northern Ireland, Russia (Kola gem crystals).
What it gets confused with
Scolecite: Near-twin, scolecite's needles are typically stouter and it's the calcium sibling; localities and labs separate them. Mesolite: Even finer cotton-fine needles, intermediate chemistry, same family puzzle. Aragonite (acicular): Aragonite fizzes in vinegar; natrolite doesn't.
What it is worth
Affordable; pristine sunburst plates are mid-range.
Where buyers get caught
Often confused with scolecite and selenite in shops; the fingernail test rules out selenite (natrolite resists).
One more thing
Kola Peninsula natrolite grows gem-clear logs big enough to facet, a needle mineral gone bodybuilder.
An education-first guide.
We do not stock natrolite. Writing it up regardless is the point of a reference library.
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