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Aragonite Needles

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Created 10/19/2004

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
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