Description
Ulexite Crystal Mineral Specimen – Natural Borate from the U.S.A.
This genuine Ulexite mineral specimen from the U.S.A. is a fascinating and highly collectible borate mineral known for its distinctive fibrous structure and unusual optical properties. Often referred to as “TV Rock” due to its natural light-transmitting qualities, Ulexite is prized by mineral collectors, geology enthusiasts, and educational institutions alike.
The photograph shows the exact specimen you will receive. Each piece is carefully selected for quality, structure, and visual appeal. Full sizing can be confirmed in the listing photographs.
This crystal is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee generic card.
Mineral Classification & Chemical Composition
Ulexite is a hydrated sodium calcium borate hydroxide mineral with the chemical formula:
NaCaB5O6(OH)6·5H2O
It belongs to the borate mineral group and forms in evaporite deposits where boron-rich waters undergo extensive evaporation in arid environments. Ulexite crystallises in the triclinic crystal system, although it is most commonly found in massive or fibrous aggregates rather than well-formed individual crystals.
Its fibrous habit is one of its defining features. The mineral forms tightly packed, parallel fibres that create a silky or satin-like appearance on cut surfaces. These fibres are responsible for its well-known optical effect.
Optical Properties – Natural Light Transmission
One of the most remarkable characteristics of Ulexite is its natural fibre optic effect. Due to the parallel arrangement of internal fibres, light is transmitted along the length of the fibres. When placed over printed text or an image, the mineral can project the image to the surface, creating a magnified visual effect.
This phenomenon makes Ulexite particularly popular in educational collections, mineral displays, and science demonstrations, as it provides a natural example of optical light transmission in crystalline materials.
The surface may display a silky lustre, while freshly broken faces can appear translucent to semi-translucent. Colour is typically white to colourless, sometimes with soft grey tones depending on inclusions or associated minerals.
Geological Formation & Locality
Ulexite forms in evaporitic sedimentary environments, particularly in dry lake beds and saline basins. In the United States, significant deposits are found in arid regions such as California and Nevada, where boron-rich brines concentrate and crystallise as water evaporates.
It commonly occurs alongside other evaporite minerals, including:
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Colemanite
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Borax
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Gypsum
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Halite
These deposits are associated with ancient inland seas and playa lakes, making Ulexite an important mineral in understanding sedimentary and evaporative geological processes.
Collecting, Display & Educational Value
This Ulexite specimen is ideal for:
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Mineral and crystal collections
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Optical mineral demonstrations
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Geological study sets
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Classroom teaching displays
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Cabinet curiosities
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Unique natural history gifts
Its distinctive fibrous texture and optical properties make it an engaging and visually intriguing specimen for both beginner and advanced collectors.
Ulexite is traditionally associated in spiritual contexts with clarity and insight; however, it is primarily valued in this listing for its mineralogical significance and geological interest.
Authenticity & Presentation
This is a genuine Ulexite mineral specimen from the U.S.A. The photograph shows the exact piece you will receive, carefully chosen for its structure and quality.
Your specimen includes a Certificate of Authenticity lifetime guarantee generic card. Please refer to the listing images for full sizing details and scale.
A distinctive natural borate mineral with remarkable optical properties, this Ulexite specimen represents both scientific interest and visual appeal, making it a standout addition to any mineral collection.
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