Figure 15. Backscattered electron photomicrographs of selected SPWW micrometeorites

Figure 17. Weight percent Al/Si and Ca/Al plot of the SPWW spherules as compared to DSS and chondritic value

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Figure 15. Backscattered electron

photomicrographs of selected

SPWW micrometeorites that in-

clude: a) a glassy spherule show-

ing a bright network of convec-

tion borders; b) a cryptocrystal-

line to fine-grained spherule; c)

a barred olivine spherule; d) a

spherule containing several relic

grains and small distributed

FeNi patches; e) a volatile-rich

spherule showing large irregu-

lar internal cavities; f) a G-type

spherule containing magnetite

dendrites in iron-rich glass; g) a

metallic FeNi particle showing

small ameoboidal domains and

meteoritic composition; h) an

IDP-like particle showing a Mg-

rich phyllosilicate matrix, dis-

tributed relic FeNi metal and

sulfide grains, and Fe staining

at the rim and surrounding in-

terior voids.

g

h

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