Ulexite is a mineral occuring in round smooth crystalline masses. Ulexite is a structually complex mineral, containing traces of sodium, water and hydroxide octehedra. These are all connected through massive boron units. Ulexite was named after the german scientist, G. L. Ulex who discovered it.
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| - Ulexite is a mineral occuring in round smooth crystalline masses. Ulexite is a structually complex mineral, containing traces of sodium, water and hydroxide octehedra. These are all connected through massive boron units. Ulexite was named after the german scientist, G. L. Ulex who discovered it.
- Ulexite is a structurally complex mineral, with a basic structure containing chains of sodium, water and hydroxide octahedra. The chains are linked together by calcium, water, hydroxide and oxygen polyhedra and massive boron units. The boron units have a formula of B5O6(OH)6 and a charge of -3, and are composed of three borate tetrahedra and two borate triangular groups.
- Ulexite (NaCaB5O6(OH)6•5(H2O)) (hydrated sodium calcium borate hydroxide), sometimes known as TV rock, is a mineral occurring in silky white rounded crystalline masses or in parallel fibers. The natural fibers of ulexite conduct light along their long axes, by internal reflection. Ulexite was named for the German chemist Georg Ludwig Ulex (1811–1883) who first discovered it. Ulexite decomposes in hot water.
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| Category
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| opticalprop
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| mohs
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| Solubility
| - Slightly soluble in water
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| Other
| - Parallel fibrous masses can act as fiber optical light pipes
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| Gravity
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| SG
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| 2V
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| streak
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| formula
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| System
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| Hard
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| strunz
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| Color
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| unit cell
| - a = 8.816 Å, b = 12.87Å, c = 6.678 Å; α = 90.25°, β = 109.12°, γ = 105.1°; Z = 2
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| tenacity
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| fluorescence
| - May fluoresce yellow, greenish yellow, cream, white under SW and LW UV
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| cleavage
| - Perfect on {010} good on {10} poor on {110}
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| habit
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| locate
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| twinning
| - Polysynthetic on {010} and {100}
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| diaphaneity
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| fracture
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| refractive
| - nα = 1.491 – 1.496
- nβ = 1.504 – 1.506 br/>nγ = 1.519 – 1.520
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| luster
| - Vitreous; silky or satiny in fibrous aggregates
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| birefringence
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| abstract
| - Ulexite is a mineral occuring in round smooth crystalline masses. Ulexite is a structually complex mineral, containing traces of sodium, water and hydroxide octehedra. These are all connected through massive boron units. Ulexite was named after the german scientist, G. L. Ulex who discovered it.
- Ulexite (NaCaB5O6(OH)6•5(H2O)) (hydrated sodium calcium borate hydroxide), sometimes known as TV rock, is a mineral occurring in silky white rounded crystalline masses or in parallel fibers. The natural fibers of ulexite conduct light along their long axes, by internal reflection. Ulexite was named for the German chemist Georg Ludwig Ulex (1811–1883) who first discovered it. Ulexite is a structurally complex mineral, with a basic structure containing chains of sodium, water and hydroxide octahedra. The chains are linked together by calcium, water, hydroxide and oxygen polyhedra and massive boron units. The boron units have a formula of B5O6(OH)6 and a charge of −3. They are composed of three borate tetrahedra and two borate triangular groups. Ulexite is found in evaporite deposits and the precipitated ulexite commonly forms a "cotton ball" tuft of acicular crystals. Ulexite is frequently found associated with colemanite, borax, meyerhofferite, hydroboracite, probertite, glauberite, trona, mirabilite, calcite, gypsum and halite. It is found principally in California and Nevada, USA; Tarapacá Region in Chile, and Kazakhstan. Ulexite is also found in a vein-like bedding habit composed of closely-packed fibrous crystals. Ulexite is also known as TV rock due to its unusual optical characteristics. The fibers of ulexite act as optical fibers, transmitting light along their lengths by internal reflection. When a piece of ulexite is cut with flat polished faces perpendicular to the orientation of the fibers, a good-quality specimen will display an image of whatever surface is adjacent to its other side (as shown in the photograph). The fiber-optic effect is the result of the polarization of light into slow and fast rays within each fiber, the internal reflection of the slow ray and the refraction of the fast ray into the slow ray of an adjacent fiber. An interesting consequence is the generation of three cones, two of which are polarized, when a laser beam obliquely illuminates the fibers. These cones can be seen when viewing a light source through the mineral. Ulexite decomposes in hot water.
- Ulexite is a structurally complex mineral, with a basic structure containing chains of sodium, water and hydroxide octahedra. The chains are linked together by calcium, water, hydroxide and oxygen polyhedra and massive boron units. The boron units have a formula of B5O6(OH)6 and a charge of -3, and are composed of three borate tetrahedra and two borate triangular groups. Ulexite is found with the mineral borax and is directly deposited in arid regions from the evaporation of water in intermittent playa lakes. The precipitated ulexite commonly forms a "cotton ball" tuft of acicular crystals. Ulexite is also found in a vein-like bedding habit composed of closely-packed fibrous crystals.
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