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Chiastolite
Chiastolite is nesosilicate (andalusite variety), Al₂SiO₅. In the hand, it rates 6.5 to 7.5 (altered surfaces softer) on the Mohs scale, and it runs gray and tan. Stubby crystal whose polished cross-section shows a natural black cross of graphite trapped in tan andalusite. Contact-metamorphosed slates; notable: Spain, China, Australia, Massachusetts (USA).
The geology.
Chiastolite carries the formula Al₂SiO₅. It belongs to the orthorhombic system. On paper it is nesosilicate (andalusite variety).
It sits at 6.5 to 7.5 (altered surfaces softer) on the Mohs scale. The surface reads vitreous to dull. Light behaviour is opaque. Specific gravity runs 3.13 to 3.16. The streak is white. It breaks with distinct prismatic cleavage.
Stubby crystal whose polished cross-section shows a natural black cross of graphite trapped in tan andalusite.
Expect to see it as polished cross-sections, tumbled or pendants.
The origins.
Contact-metamorphosed slates; notable: Spain, China, Australia, Massachusetts (USA).
On value, the database notes: common and affordable.
Traditional associations.
In energy work traditions, associated with protection and balance at crossroads.
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.
Stubby crystal whose polished cross-section shows a natural black cross of graphite trapped in tan andalusite.
Painted or laser-etched 'cross stones' appear in tourist markets, verify the cross penetrates the stone.
| Looks like | How to tell them apart |
|---|---|
| Staurolite | Staurolite forms actual intergrown cross-shaped twin crystals; chiastolite shows a cross pattern inside a single crystal |
| Painted pebbles | Paint sits on the surface; a real cross runs through the stone, check both ends |
| Tourmaline cross-section | Tourmaline cross-sections show triangular zoning, not a cross |
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 chiastolite.
| Test | What you should see |
|---|---|
| By eye | Cross visible on both cut ends |
| Scratch check | Scratches glass when fresh |
| By eye | Pattern continues through the stone if re-cut |
Anything that scratches, burns or dissolves the piece is a lab job. Get it appraised rather than testing it apart.
Care & handling.
At 6.5 to 7.5 (altered surfaces softer) 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 distinct prismatic cleavage, which is worth knowing before you set it or drop it.
Warm water and a soft cloth clean almost everything. Ultrasonic tanks, steamers and household cleaners are where pieces get ruined.
A deeper look.
Extended detail on composition, sourcing, authentication and market value.
The physical record
The formula on record is Al₂SiO₅. Crystal system: Orthorhombic. Specific gravity: 3.13 to 3.16. Streak: White. Cleavage and fracture: Distinct prismatic cleavage.
How it reaches the market
Contact-metamorphosed slates; notable: Spain, China, Australia, Massachusetts (USA).
What it gets confused with
Staurolite: Staurolite forms actual intergrown cross-shaped twin crystals; chiastolite shows a cross pattern inside a single crystal. Painted pebbles: Paint sits on the surface; a real cross runs through the stone, check both ends. Tourmaline cross-section: Tourmaline cross-sections show triangular zoning, not a cross.
What it is worth
Common and affordable.
Where buyers get caught
Painted or laser-etched 'cross stones' appear in tourist markets, verify the cross penetrates the stone.
One more thing
The cross forms as the growing crystal sweeps graphite from the surrounding slate into its corners.
An education-first guide.
No product links here. We do not sell chiastolite, and a guide that only covers our own shelves would not be much of a guide.
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