On Tuesday, October 20, the Museum will close at 3 pm, and the Hall of Ocean Life will be closed all day.
Part of Hall of Planet Earth.
AMNH/R.Mickens
This boulder of nearly pure quartz formed when hot silica-bearing waters flowing through a fracture deposited quartz. Small bubbles of these waters are visible in the sample.
Provided by Valley Marble and Slate, New Milford, Connecticut