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Picture of the day
Sand
is a
granular
material composed of finely divided
rock
and
mineral
particles. This collage depicts samples of nine types of sand, in rows from left to right:
Glass sand from
Kauai
, Hawaii
Dune
sand from the
Gobi Desert
Quartz
sand with green
glauconite
from Estonia
Volcanic sand with reddish weathered
basalt
from
Maui
, Hawaii
Biogenic
coral sand
from
Molokai
, Hawaii
Coral pink sand
from Utah
Volcanic glass
sand from California
Garnet
sand from Emerald Creek, Idaho
Olivine
sand from
Papakolea
, Hawaii
Photograph credit:
Siim Sepp
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