Letter | Published:

Water in non-carbonaceous stony meteorites

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Abstract

WE report here on high-voltage electron microscope observations of the hydrous alteration products of olivine in an achondrite and an ordinary chondrite—two classes of meteorite in which hydrous minerals are rare. We argue that the Nakhla achondrite, and perhaps the Weston chondrite, contain water of extraterrestrial origin which was mobilised by mild shock deformation. The observations suggest that both meteorites have unusual volatile constituents.

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