PDS_VERSION_ID        = PDS3
RECORD_TYPE           = STREAM

OBJECT                = TEXT
  PUBLICATION_DATE    = 2009-11-15
  NOTE                = "Sample description"
END_OBJECT            = TEXT
END

High-level Description: Nodular silicate-rich material coating the surface of
the Keanakako'i ash outcrop, with entrained accretionary lapiili visible
underneath the silicate-rich crust (3760, 3764); coating is 5 years old.
Accretionary lapilli entrained. Nodules created where acidic water mixed in
with magma dissolves SiO2. Water reaches the surface and evaporates, leaving
SiO2 (opal) and other evaporites.

Fine ash comprised of very angular, poorly-sorted non-vitric fragments, sub-mm
in size, with glassy clasts and lithics (5-10%) intermixed. Accretionary
lapilli averaging 1-6 mm across comprised of ash grains are common, though
some lapilli are smaller (averaging 0.5 mm). Lapilli are more resistant to
weathering than matrix and prominently stand above the surrounding material.
Exposed surfaces are weathered from acidic mist. Sockets are visible where
accretionary lapilli have been removed (3767). At the cm-dm scale, water-cut
channels that meander around lapilli are visible.

Texture
  Grain morphology and appearance: Accretionary lapilli consolidated in a
silicate-rich, tan-grey chemical coating. Accretionary lapilli show a granular
texture and an internal structure of concentric layers (3761, 3765). Ash in
exposed lapillus is vitreous, sub-round, varies from clear to tan to dark
brown, and very-fine, with grains about 40-50 micrometers in diameter.
Internal concentric rings are 1-4 mm in scale, and core is 1.5 mm. Weathered
lapilli are brownish, while fresher lapilli are black (3766). The ash
associated with this sample is vitreous, light brown to black, and sub-round.
  Grain size and sorting:  Accretionary lapilli are 0.5-6.0 mm in diameter;
ash grains are 0.1 mm or less. Poor sorting.
  Grain fabric:  Random orientation.

Sediment structure:  N/A.

Color: Black, dark grey, clear, or tan to dark brown ash grains. Color of ash
grains give color to accretionary lapilli.