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Fig. 2.1
Secondary electron images of typical dust particles of northern Africa collected during
the SAMUM I campaign in Morocco. At the bottom of the images, the major elements analyzed
by energy-dispersive X-ray technique (EDX) are labelled. In the following, common atmospheric
minerals with the specified composition (and matching the morphology of the particle) are given
in parenthesis. (
a
) Si-rich particle (quartz), (
b
) Na-bearing aluminosilicate (albite), (
c
) K-bearing
aluminosilicate (illite), (
d
) Mg-dominated silicate (palygorskite), (
e
) Ca sulfate and Ca-dominated
mineral (gypsum on calcite), (
f
) Fe-dominated mineral (iron oxide or iron hydroxide), (
g
)
complex internally mixed aluminosilicate with individual Fe-dominated phase (bright spot in
center), (
h
) Ca-P-S-bearing particle (biological?), (
i
) Si-dominated particle (opaline diatom), (
j
)
aluminosilicate (kaolin group?) with Ca(Na) sulfate (gypsum, thenardite, glauberite?), and (
k
)
Si-rich particle (quartz) with sulfate coating (overview). (
l
) Detail of coating with EDX spectra
for rim and core of the particle
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