Volcanic ash, Spurr (Stop 33)
Categories
TERRESTRIAL AEROSOLS
Summary: AEROSOLS
Cosmic analogs subcategories
Asteroids
Circumstellar shells
Comets
Terrestrial Aerosols Subcategories
Volcanic
Origin
Crater Peak on the south side of Mount Spurr volcano, across Cook Inlet, Alaska, USA, 125 km west of Anchorage. The particles are from the 17 September 1992 eruption and were collected 185 km east of the volcano.
Main constituent
57-78 wt% glass, plagioclase feldspar, opx, magnetite, amphibole, cpx
Practical significance
Interpretation of remote sensing data. Analogues of other planets' atmospheric dust, and dust in comets, asteroids, and circumstellar shells.
Particle size Fraunhofer: reff (μm)
14.4
Particle size Fraunhofer: veff
6.6
Size distribution plot:
Size distribution table
Particle shape
Irregular
Imaging
SEM
SEM/TEM images:
All SEM/TEM images (zip file)
Color
Dark grey
Scattering matrix (1) wavelength in nm
632.80 nm
Scattering matrix (1) table
Scattering matrix (1) plot:
Refractive index
Estimated to be in the range [1.48-1.56] + i[0.0018-0.02]
Angle range (deg)
[3,174]
Reference/s