Volcanic ash, Spurr (Stop 33)

Practical significance

Interpretation of remote sensing data. Analogues of other planets' atmospheric dust, and dust in comets, asteroids, and circumstellar shells.

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

Color

Dark grey

Particle size Fraunhofer: reff (μm)

14.4

Particle size Fraunhofer: veff

6.6

Size distribution plot:

Size distribution table

matrix_spurrstop33_633nm.txt

Particle shape

Irregular

SEM/TEM images:

All SEM/TEM images (zip file)

Spurr (Stop 33) SEM Images

Scattering matrix (1) wavelength in nm

632.80 nm

Scattering matrix (1) table

matrix_spurrstop33_633nm_0.txt

Scattering matrix (1) plot:

Scattering matrix elements Spurr (Stop 33)

Refractive index

Estimated to be in the range [1.48-1.56] + i[0.0018-0.02]

Angle range (deg)

[3,174]

Reference/s

Muñoz et al., 2004