Sample of ulexite

Sample of ulexite

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Credit: BEN JOHNSON/SCIENCE PHOTO LIBRARY

Caption: Sample of ulexite. Ulexite is a form of hydrated sodium calcium borate. It rarely forms distinct crystals, being seen instead as spongy rounded masses or the aggregate of long, hair-like fibres as here. This form is composed of natural optical fibres, earning it the name 'television stone'. Ulexite is formed by evaporitic precipitation in desert and semi-desert lake basins, and is a major ore of boron. Large deposits are located in the Mojave Desert (California) and in the Atacama Desert of Chile.

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Keywords: boron, boron ore, earth science, geology, ore, ulexite

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