Johnstown vs Ibitira
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Johnstown
Johnstown is a diogenite meteorite that fell near Johnstown, Colorado, in July 1924 after a witnessed fireball and detonations. About 23 kilograms of material were recovered, making it a substantial documented diogenite fall. Its coarse-grained, orthopyroxene-rich composition places it within the howardite-eucrite-diogenite clan, meteorites generally interpreted as samples from deep within the cru...
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Ibitira
Ibitira is a basaltic achondrite meteorite that fell near Martinho Campos in Minas Gerais, Brazil, in 1957. It was historically compared with eucrites because its mineralogy and basaltic texture indicate formation from differentiated planetary material. Its oxygen-isotope composition differs from that of typical HED meteorites linked to Vesta, however, so it is classified as an ungrouped achondrit...
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