Volcanic ash, Redoubt B
Practical significance
Interpretation of remote sensing data. Analogues of other planets' atmospheric dust, and dust in comets, asteroids, and circumstellar shells.
Origin
Redoubt volcano, Cook Inlet, Alaska, USA, 283 km southwest of Anchorage. The particles are from the 1989-1990 eruption and were collected 200 km from the volcano. The coarse fraction was removed by sieving.
Main constituent
68-76 wt% glass, plagioclase feldspar, hornblende, cps, opx, magnetite, ilmenite
Color
Light gray
Particle size Fraunhofer: reff (μm)
6.4
Particle size Fraunhofer: veff
7.6
Size distribution plot:
Size distribution table
Particle shape
Similar to Redoubt A particles
SEM/TEM images:
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] + i0.0018
Angle range (deg)
[3,173]
Reference/s