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28 April 2012

Geology Word of the Week: U is for Ulexite

def. Ulexite: 1. Hydrated sodium calcium borate hydroxide (formula: NaCaB5O6(OH)6•5(H2O) ), a silky, brittle, generally white evaporate mineral  which often crystallizes in the form of densely-packed fibers that transmit light along the long axis of the mineral. 2. A party trick rock. Have any party guests who think that geology isn’t awesome? Just pull out your fibrous ulexite sample and say, “Hey look, I have a fiber optic rock.” Then …

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