Spectrum water ice spherical particles (67±31 µm) Spectrum 99wt% Water Ice (67±31 µm) - 1wt% Kerite (45-63 µm) intimate mixture Spectrum 92wt% Water Ice (67±31 µm) - 8wt% Kerite (45-63 µm) intimate mixture Spectrum 70wt% Water Ice (67±31 µm) - 30wt% Kerite (45-63 µm) intimate mixture Spectrum Kerite grains (45-63 µm)

Spectrum water ice spherical particles (67±31 µm) Spectrum 99wt% Water Ice (67±31 µm) - 1wt% Kerite (0-25 µm) intimate mixture Spectrum 91wt% Water Ice (67±31 µm) - 9wt% Kerite (0-25 µm) intimate mixture Spectrum 77wt% Water Ice (67±31 µm) - 23wt% Kerite (0-25 µm) intimate mixture Spectrum Kerite grains (0-25 µm)

Spectrum water ice spherical particles (67±31 µm) Spectrum 95wt% Water Ice (67±31 µm) - 5wt% Pyrrhotite (25-50 µm) intimate mixture Spectrum 81wt% Water Ice (67±31 µm) - 19wt% Pyrrhotite (25-50 µm) intimate mixture Spectrum 48wt% Water Ice (67±31 µm) - 52wt% Pyrrhotite (25-50 µm) intimate mixture Spectrum Pyrrhotite grains (25-50 µm)

Spectrum Kerite grains (25-50 µm) Spectrum 50wt% Kerite (25-50 µm) - 50wt% Pyrrhotite (0-25 µm) intimate mixture Spectrum 33wt% Kerite (25-50 µm) - 67wt% Pyrrhotite (0-25 µm) intimate mixture Spectrum Pyrrhotite grains (0-25 µm)