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Facts and Figures |
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name of sample |
Mount St. Helens |
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origin |
Mount St. Helens volcano in southwest Washington, USA. The particles |
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were collected 6 km north of the crater after a large eruption on 18 May |
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1980. The coarse fraction was removed by sieving. |
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main constituents |
64 wt% glass, plagioclase feldspar, opx, amphibole, magnetite, ilmenite, cpx |
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particle size |
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reff=4.1 micrometer, veff =9.5 |
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particle shape |
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refractive index |
estimated to be around: |
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1.48-1.56 - i0.0018 |
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color |
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scattering matrix |
from 3-173 degrees scattering angle |
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wavelength |
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article |
Scattering matrices of volcanic ash particles of Mnt. St. Helens, Redoubt, and Mount |
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Spurr volcanoes |
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Muñoz O, Volten H, Hovenier JW. Veihelmann B, van der Zande WJ, Waters LBFM, Rose WI |
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Journal of Geophysical Research, 109,10.1029/2004JD004684,2004 |
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