Image of the Week Gallery
ESEM image of aragonite (CaCO 3) "needles" growing from a calcite (CaCO 3) crystal base on a stainless steel washer substrate. The crystals shown in this image precipitated from Mammoth Hot Springs in Yellowstone National Park over a 48-hour period.
- Thomas J. Schickel , Department of Geology
- Bruce W. Fouke , Department of Geology