Ulexite Cut California USA TV Stone Mineral Specimen 20-60mm Genuine Collector Display Piece with Certificate

Ulexite (Cut) – Natural TV Stone Mineral from California, USA

This genuine cut Ulexite specimen from California, USA, is a naturally occurring borate mineral renowned for its remarkable optical properties. Carefully shaped and polished to reveal its internal fibrous structure, each piece measures approximately 20–60mm. The photograph shows an example of the actual specimen you will receive. Please refer to the images for full sizing and natural variation within this range.

Your Ulexite specimen includes a Certificate of Authenticity lifetime guarantee generic card, confirming it is a 100% genuine natural mineral from California.

Mineral Species & Chemical Composition

Ulexite is a hydrated sodium calcium borate mineral with the chemical formula:

NaCaB₅O₆(OH)₆·5H₂O

It belongs to the borate mineral group and crystallises in the triclinic crystal system. Ulexite typically forms in fibrous, silky aggregates rather than distinct individual crystals.

Key mineralogical properties include:

• Mineral Group: Borate

• Crystal System: Triclinic

• Hardness: 2.5 on the Mohs scale

• Lustre: Silky to vitreous

• Transparency: Translucent to opaque

• Cleavage: Perfect in one direction

The fibrous internal structure is responsible for its most famous feature — the ability to transmit light along its fibres.

Optical Effect – “TV Stone” Phenomenon

Cut and polished Ulexite is commonly referred to as “TV Stone” due to its natural fibre-optic effect. When placed over printed text or images, the stone transmits and projects the image through its fibres, making it appear on the upper surface.

This optical property occurs because tightly packed parallel fibres act as natural light conduits. The effect is entirely natural and results directly from the mineral’s internal crystal structure. The flat polished surface enhances this phenomenon by aligning the fibres vertically for optimal light transmission.

Geological Formation & Locality

Ulexite forms in evaporite deposits within arid, saline lake environments. In California, significant deposits occur in borate-rich basins such as those in the Mojave Desert region.

The mineral forms when boron-rich waters evaporate, leaving behind borate minerals in layered sedimentary deposits. Ulexite is commonly associated with:

• Colemanite

• Borax

• Gypsum

• Other evaporite minerals

These evaporite environments create layered accumulations where Ulexite develops in fibrous masses within clay or sedimentary host rock.

Colour, Structure & Natural Features

California Ulexite typically appears:

• Colourless to white

• Creamy white to pale grey

• Silky or fibrous in texture

The cut surface reveals the internal fibre bundles responsible for its optical transmission. Minor natural inclusions or host material traces may be visible and are part of the mineral’s natural formation. No artificial enhancement is applied.

Collecting & Display Appeal

This 20–60mm cut Ulexite specimen is ideal for:

• Mineral cabinet collections

• Educational demonstrations of natural optical phenomena

• Geological teaching displays

• Unique conversation pieces

• Collector gift items

Ulexite is especially valued by collectors for its scientific interest and rare fibre-optic effect. In some traditions, it is spiritually associated with clarity and insight; these associations are belief-based rather than scientific.

Authenticity & Careful Selection

Each cut Ulexite piece is individually selected for clarity of fibre alignment and overall display quality. The listing photograph shows an example of the actual specimen you will receive within the stated 20–60mm size range. Please review all images for scale and natural variation.

Every specimen is supplied with a Certificate of Authenticity lifetime guarantee generic card, confirming its genuine natural origin from California, USA.

A classic example of evaporite mineral formation combined with a striking natural optical phenomenon, this California Ulexite specimen offers both geological significance and distinctive display appeal.