Altered peridotite

Altered peridotite from the cliffs beneath Lost City. The dark colored material is composed dominantly of the mineral serpentine, which forms when seawater interacts with the mineral olivine. The rounded gray patches are magnesium- and iron- and silica-bearing minerals called enstatite. This sample is typical of mantle material recovered from the seafloor. Image courtesy of University of Washington.

Related Links

The Lost City 2005

The Lost City 2005: Overview

NOAA Ocean Explorer Gallery

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