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Tincalconite is a hydrous sodium borate mineral closely related to borax, and is a secondary mineral that forms as a dehydration product of borax. Its formula is Na 2 B 4 O 7 ·5H 2 O or Na 2 [B 4 O 5 (OH) 4]·3H 2 O. Tincalconite typically occurs as a fine grained white powder.
Borax is also easily converted to boric acid and other borates, which have many applications. Its reaction with hydrochloric acid to form boric acid is: Na 2 B 4 O 7 ·10H 2 O + 2 HCl → 4 H 3 BO 3 + 2 NaCl + 5 H 2 O. Borax is sufficiently stable to find use as a primary standard for acid-base titrimetry. [17]: p.316
Borax crystals. Common borate salts include sodium metaborate (NaBO 2) and borax. Borax is soluble in water, so mineral deposits only occur in places with very low rainfall. Extensive deposits were found in Death Valley and shipped with twenty-mule teams from 1883 to 1889. In 1925, deposits were found at Boron, California on the edge of the ...
People are ingesting borax. Also known by its chemical name sodium borate decahydrate, borax is a salt typically used to kill ants and boost laundry detergent, among other household cleaning needs ...
Rio Tinto Borax mine and plant, 2012 Rio Tinto Borax mine from ISS, 2013 Borax crystals, Boron Mine. Scale is one inch, ruled at one cm. The Rio Tinto Boron Mine (formerly the U.S. Borax Boron Mine) in Boron, California is California's largest open-pit mine and the largest borax mine in the world, producing nearly half the world's
Crystals are rare but will form fibrous, elongated crystals either oriented parallel or radial to each other. Crystals may also be acicular, resembling needles (Anthony et al., 2005). [16] The point group of ulexite is 1, which means that the crystals show very little symmetry as there are no rotational axes or mirror planes.
In 1883, prospectors discovered a rich vein of colemanite borax in the Calico Mountains 4 miles east from the silver mining town of Calico. The claim was bought by mining tycoon William Tell Coleman, who owned and worked several borax mines in Death Valley, including the Harmony Borax Works, famous for the Twenty-mule teams which were used to haul borax to the railroads at Mojave, California.
Unlike silicates, boron minerals never contain boron with coordination number greater than four. A typical motif is exemplified by the tetraborate anions of the common mineral borax, shown at left. The formal negative charge of the tetrahedral borate center is balanced by metal cations in the minerals, such as the sodium (Na +) in borax. [1]