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Datolite
Datolite is nesosilicate (calcium borosilicate), CaBSiO₄(OH). In the hand, it rates 5 to 5.5 on the Mohs scale, and it runs pale green and colorless. Pale bottle-glass-green blocky crystals with many small faces, or, in Michigan form, opaque porcelain nodules in sherbet colors with copper flecks.
The geology.
Datolite carries the formula CaBSiO₄(OH). It belongs to the monoclinic system. On paper it is nesosilicate (calcium borosilicate).
It sits at 5 to 5.5 on the Mohs scale. The surface reads vitreous. Light behaviour is transparent to translucent. Specific gravity runs 2.96 to 3.0. The streak is white. It breaks with no cleavage; conchoidal fracture.
Pale bottle-glass-green blocky crystals with many small faces, or, in Michigan form, opaque porcelain nodules in sherbet colors with copper flecks.
Expect to see it as glassy complex crystals, porcelain-like nodules or crusts in basalt.
The origins.
Basalt cavities: Keweenaw Peninsula (Michigan, USA, porcelain nodules with copper), New Jersey (USA), Russia, Norway.
On value, the database notes: mid-range; copper-included Keweenaw nodules are regional treasures.
Traditional associations.
In energy work traditions, datolite is linked in modern writing with memory, study, and problem-solving.
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.
Pale bottle-glass-green blocky crystals with many small faces, or, in Michigan form, opaque porcelain nodules in sherbet colors with copper flecks.
| Looks like | How to tell them apart |
|---|---|
| Apophyllite | Apophyllite shows pearly base faces and right-angle form; datolite's crystals are complex wedges |
| Prehnite | Prehnite is botryoidal with a foggy glow; datolite crystals are water-clear pale green |
| Calcite | Calcite fizzes and cleaves into rhombs |
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 datolite.
| Test | What you should see |
|---|---|
| Acid check | No fizz |
| Scratch check | Knife barely scratches it (Mohs ~5.5) |
| By eye | Complex many-faced glassy crystals |
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 no cleavage; 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 CaBSiO₄(OH). Crystal system: Monoclinic. Specific gravity: 2.96 to 3.0. Streak: White. Cleavage and fracture: No cleavage; conchoidal fracture.
How it reaches the market
Basalt cavities: Keweenaw Peninsula (Michigan, USA, porcelain nodules with copper), New Jersey (USA), Russia, Norway.
What it gets confused with
Apophyllite: Apophyllite shows pearly base faces and right-angle form; datolite's crystals are complex wedges. Prehnite: Prehnite is botryoidal with a foggy glow; datolite crystals are water-clear pale green. Calcite: Calcite fizzes and cleaves into rhombs.
What it is worth
Mid-range; copper-included Keweenaw nodules are regional treasures.
One more thing
Michigan's datolite nodules are prized like agates, cut ones show pastel porcelain centers peppered with native copper.
An education-first guide.
We do not carry datolite. 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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