One of the interesting rocks recovered in
dredge 66. It has a manganese crust on top of an iron hydroxide
layer (which was once the volcanic glass layer that has now weathered).
The vesicles inside the rock have been filled in by calcite of various
colors (white and yellow). This sample was recovered from the west
flank of Floreana Island. It looks much older than many of the other
seafloor volcanic rocks we have recovered on this expedition.
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