Image of the Week: April 17 - 23, 2005
Mount St. Helen's Dome Dacite
Micrograph of the new dome's dacite shows somewhat larger crystals in a groundmass of glass and very small crystals. The larger crystals formed while the magma cooled more slowly deep underground.
The groundmass has formed at, or near, the surface and results from more rapid cooling.
U.S.G.S. image from CVO.
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LCC Image of the Week 07-08-05
David Cordero
dcordero@lcc.ctc.edu