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Indicolite
Indicolite is cyclosilicate (tourmaline group), Na(Li,Al)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄ + Fe. In the hand, it rates 7 to 7.5 on the Mohs scale, and it runs deep indigo blue and teal-blue. Indigo-to-teal tourmaline pencils, striated three-sided prisms whose blue darkens dramatically looking down the crystal's length.
The geology.
Indicolite carries the formula Na(Li,Al)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄ + Fe. It belongs to the trigonal system. Catalogues list it as cyclosilicate (tourmaline group).
It sits at 7 to 7.5 on the Mohs scale. The surface reads vitreous. Light behaviour is transparent to translucent. Specific gravity runs 2.9 to 3.1. The streak is white. It breaks with no cleavage; conchoidal fracture.
Indigo-to-teal tourmaline pencils, striated three-sided prisms whose blue darkens dramatically looking down the crystal's length.
It reaches buyers as striated prisms, pencils in quartz, faceted or slices.
The origins.
Pegmatites: Brazil (Cruzeiro, Santa Rosa), Afghanistan, Namibia, Maine (USA, historic).
On value, the database notes: mid-range to prized; clean deep-blue gems climb fast.
Traditional associations.
In energy work traditions, associated with calm articulate truth and deep peace.
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.
Indigo-to-teal tourmaline pencils, striated three-sided prisms whose blue darkens dramatically looking down the crystal's length.
Heated greenish stones get sold as finer 'indicolite'; blue glass impostors lack striations.
| Looks like | How to tell them apart |
|---|---|
| Blue topaz | Topaz is unstriated with basal cleavage and paler sky tones |
| Aquamarine | Aqua is hexagonal beryl, lighter-toned, without the strong two-direction color shift |
| Dyed quartz | Dye pools in cracks; indicolite's blue is body color with pleochroism |
At-home tests.
Before anyone talks you into a lab report, these are the checks worth doing yourself on indicolite.
| Test | What you should see |
|---|---|
| By eye | Striations + rounded-triangle cross-section |
| By eye | Strong light/dark pleochroism down the length |
| Scratch check | Scratches glass (Mohs 7+) |
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 7 to 7.5 on the Mohs scale it stands up to everyday wear. It will still chip on a hard knock, so treat edges and points with respect.
It breaks with no cleavage; conchoidal fracture, 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 Na(Li,Al)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄ + Fe. Crystal system: Trigonal. Specific gravity: 2.9 to 3.1. Streak: White. Cleavage and fracture: No cleavage; conchoidal fracture.
How it reaches the market
Pegmatites: Brazil (Cruzeiro, Santa Rosa), Afghanistan, Namibia, Maine (USA, historic).
What it gets confused with
Blue topaz: Topaz is unstriated with basal cleavage and paler sky tones. Aquamarine: Aqua is hexagonal beryl, lighter-toned, without the strong two-direction color shift. Dyed quartz: Dye pools in cracks; indicolite's blue is body color with pleochroism.
What it is worth
Mid-range to prized; clean deep-blue gems climb fast.
Where buyers get caught
Heated greenish stones get sold as finer 'indicolite'; blue glass impostors lack striations.
One more thing
True blue is tourmaline's scarcest common color, fine indicolite often outprices the pink and green crowd-pleasers.
An education-first guide.
We do not stock indicolite. Writing it up regardless is the point of a reference library.
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