Many of the unusual magnetite morphologies previously observed only in the CI chondrites have been seen in the CM chondrites, Essebi and Haripura. These include: heavily textured spheroids, which are possibly spherulites, found both singly and in groups of up to a dozen and ranging in size from ~4 to 10 μm in diameter; collections of microcrystals varying from ~0.3 to 6 μm in diameter; spheres of ~1 to 6 μm in diameter; layered, nearly circular plates, forming a spheroidal plaquette ~7.5 μm in diameter; clusters of variable sized nodules, ~1.5 to 6 μm, with concave features; framboidal magnetite; and finally collections of less distinctive globules. |