Allende has small, spherical to subspherical structures called chondrules (all chondrites have these). Allende also contains whitish, irregularly-shaped patches called CAIs (“calcium-aluminum inclusions”), composed of high-temperature Ca-Al-Ti silicates & oxides. The blackish, fine-grained, carbon-rich matrix consists of Fe-olivine & poorly graphitized carbon. A few tiny specks of metallic iron-nickel alloy also occur. Allende rocks represent the near-oldest meteoritic material known. The olivine chondrules in Allende rocks date to 4.560 billion years. The CAIs in Allende rocks date to 4.568 billion years.
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