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Ulexite
Ulexite is borates, NaCaB5O6(OH)6·5H2O. In the hand, it rates 2.5 on the Mohs scale, and it runs white and colorless. Set a polished slab on printed text and the words leap to the top surface, millions of parallel natural fibers pipe the image upward like fiber-optic cable.
The geology.
Ulexite carries the formula NaCaB5O6(OH)6·5H2O. It belongs to the triclinic system. Catalogues list it as borates.
It sits at 2.5 on the Mohs scale. The surface reads silky to vitreous. Light behaviour is transparent to translucent. Specific gravity runs 1.95 to 1.96. The streak is white. It breaks with perfect cleavage one direction; fibrous fracture.
Set a polished slab on printed text and the words leap to the top surface, millions of parallel natural fibers pipe the image upward like fiber-optic cable.
It reaches buyers as polished fiber-optic slabs, cottonball nodules or fibrous veins.
The origins.
Evaporite basins, Boron and Death Valley (California), Turkey, Argentina; forms with borax and colemanite.
On value, the database notes: common and very affordable.
Traditional associations.
In energy work traditions, ulexite is called a stone of clear vision, said to help see situations exactly as they are.
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.
Set a polished slab on printed text and the words leap to the top surface, millions of parallel natural fibers pipe the image upward like fiber-optic cable.
Rarely faked, but colored fiber-optic glass (ulexite's man-made cousin) is sometimes sold as 'rainbow ulexite', real ulexite is white and soft.
| Looks like | How to tell them apart |
|---|---|
| Selenite (satin spar) | Satin spar is silky too but never projects an image through itself; it also flexes light as sheen, not as a picture |
| Fiber-optic glass | Man-made fiber glass does the same trick in candy colors and feels glassier and heavier |
| Howlite | Howlite is harder, opaque, and shows grey web veins |
At-home tests.
Before anyone talks you into a lab report, these are the checks worth doing yourself on ulexite.
| Test | What you should see |
|---|---|
| The TV test | text projects to the polished top = ulexite |
| Scratch check | Fingernail scratches it (hardness 2.5) |
| By eye | Very light in the hand (SG under 2) |
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 2.5 on the Mohs scale this is a soft material. Keep it as a display piece, store it apart from harder stones, and skip daily-wear settings.
It breaks with perfect cleavage one direction; fibrous 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.
Water-soluble over time; keep dry and away from prolonged handling moisture.
A deeper look.
Extended detail on composition, sourcing, authentication and market value.
The physical record
The formula on record is NaCaB5O6(OH)6·5H2O. Crystal system: Triclinic. Specific gravity: 1.95 to 1.96. Streak: White. Cleavage and fracture: Perfect cleavage one direction; fibrous fracture.
How it reaches the market
Evaporite basins, Boron and Death Valley (California), Turkey, Argentina; forms with borax and colemanite.
What it gets confused with
Selenite (satin spar): Satin spar is silky too but never projects an image through itself; it also flexes light as sheen, not as a picture. Fiber-optic glass: Man-made fiber glass does the same trick in candy colors and feels glassier and heavier. Howlite: Howlite is harder, opaque, and shows grey web veins.
What it is worth
Common and very affordable.
Where buyers get caught
Rarely faked, but colored fiber-optic glass (ulexite's man-made cousin) is sometimes sold as 'rainbow ulexite', real ulexite is white and soft.
One more thing
Each crystal fiber acts as a true optical waveguide with internal reflection, nature invented fiber optics in a desert lakebed long before telecom labs did.
An education-first guide.
We do not stock ulexite. Writing it up regardless is the point of a reference library.
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