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COSMOCHEMISTRY iLLUSTRATED Earliest Minerals: Pre-Solar Earliest Minerals: Pre-Solar Grains Grains Earliest Minerals Diamond Graphite Corundum Silicon Carbide T. Dalton

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Earliest Minerals: Pre-Solar Grains. Diamond. Graphite. T. Dalton. Silicon Carbide. Corundum. Earliest Minerals: Pre-Solar Grains. - PowerPoint PPT Presentation

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Page 1: Earliest Minerals: Pre-Solar Grains

COSMOCHEMISTRY iLLUSTRATED

Earliest Minerals: Pre-Solar GrainsEarliest Minerals: Pre-Solar Grains

Earliest Minerals

Diamond Graphite

CorundumSilicon Carbide

T. Dalton

Page 2: Earliest Minerals: Pre-Solar Grains

COSMOCHEMISTRY iLLUSTRATED

Earliest Minerals: Pre-Solar GrainsEarliest Minerals: Pre-Solar Grains

Earliest Minerals

Type Abundance (parts per million) Size

Nanodiamond (C) 1400 2 nanometers

Silicon carbide (SiC) 14 0.1-20 micrometers

Graphite (C) 10 1-20 micrometers

Carbides of titanium, zirconium, molybdenum, ruthenium, and iron, and iron-nickel metal

Small grains inside presolar graphite 5-220 nanometers

Silicon nitride (Si3N4) >0.002 About 1 micrometer

Corundum (Al2O3) About 0.05 0.5-3 micrometers

Spinel (MgAl2O4) <0.05 0.1-3 micrometers

Hibonite (CaAl12O19) 0.002 2 micrometers

Titanium dioxide (TiO2) One grain About 1 micrometer


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