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Encyclopedia > Ulexite

Ulexite (NaCaB5O9ยท8H2O) (hydrated sodium calcium borate hydroxide) is a mineral occurring in silky white rounded crystalline masses or in parallel fibers. It was named after the 19th century German chemist G. L. Ulex who first discovered it. General Name, Symbol, Number sodium, Na, 11 Chemical series alkali metals Group, Period, Block 1, 3, s Appearance silvery white Atomic mass 22. ... General Name, Symbol, Number calcium, Ca, 20 Chemical series alkaline earth metals Group, Period, Block 2, 4, s Appearance silvery white Atomic mass 40. ... General Name, Symbol, Number boron, B, 5 Chemical series metalloids Group, Period, Block 13, 2, p Appearance black/brown Atomic mass 10. ... General Name, Symbol, Number oxygen, O, 8 Chemical series Chalcogens Group, Period, Block 16, 2, p Appearance colorless Atomic mass 15. ... Water (from the Old English word wæter; c. ... This article is about minerals in the geologic sense; for nutrient minerals see dietary mineral; for the band see Mineral (band). ...


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. Hardness is 2 (softer than a fingernail) and specific gravity is approximately 1.97. Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer. ... Relative density (also known as specific gravity) is a measure of the density of a material. ...


Ulexite is found with the mineral borax and is directly deposited in arid regions from the evaporation of water in intermittent lakes called playas. 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, also known as "TV rock" due to its unusual optical characteristics. The fibers of TV rock act as fiber optics, transmitting light along their lengths by internal reflection, and when a piece of TV rock 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. Borax is a somewhat generic name used to describe a number of closely related minerals or chemical compounds: anhydrous borax (Na2B4O7) borax pentahydrate (Na2B4O7 Â· 5H2O) borax decahydrate (Na2B4O7 Â· 10H2O) The borax term is most usually used to describe borax decahydrate. ... It has been suggested that this article or section be merged with salt pan (geology). ... Television is a telecommunication system for broadcasting and receiving moving pictures and sound over a distance. ... Fiber Optic strands An optical fiber in American English or fibre in British English is a transparent thin fiber for transmitting light. ...


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 as discovered by E. Aalto and explained by D. Garlick and B. Kamb (J.Geol.Ed., 1991).


Ulexite decomposes in hot water.


Ulexite is found principally in California and Nevada, USA; Tarapaca Region in Chile, and Kazakhstan. State nickname: The Golden State Official languages English Capital Sacramento Largest city Los Angeles Governor Arnold Schwarzenegger (R) Senators Dianne Feinstein (D) Barbara Boxer (D) Area  - Total  - % water Ranked 3rd 410,000 km² 4. ... State nickname: Silver State, Battle Born State (official) Official languages None Capital Carson City Largest city Las Vegas Governor Kenny Guinn (R) Senators Harry Reid (D) John Ensign (R) Area  - Total  - % water Ranked 7th 286,367 km² 0. ... ...


External link

  • http://www.gc.maricopa.edu/earthsci/imagearchive/ulexite.htm

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  Results from FactBites:
 
Ulexite - definition of Ulexite in Encyclopedia (364 words)
Ulexite is a structurally complex mineral, with a basic structure containing chains of sodium, water and hydroxide octahedrons.
Ulexite is found with the mineral borax and is directly deposited in arid regions from the evaporation of water in intermittent lakes called playas.
Ulexite is also found in a vein-like bedding habit composed of closely-packed fibrous crystals, also known as "TV rock" due to its unusual optical characteristics.
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