description Johnstown Overview
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 crust of asteroid 4 Vesta.
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What type of meteorite is Johnstown?
Johnstown is a diogenite, a rare type of achondrite meteorite dominated by coarse-grained orthopyroxene. Diogenites are thought to originate from the crust of the asteroid Vesta.
When and where did the Johnstown meteorite fall?
Johnstown fell in July 1924 near the town of Johnstown, Colorado, after a witnessed fireball and detonations. The fall was observed and material was recovered shortly afterward.
How much Johnstown meteorite material was recovered?
About 23 kilograms of material were recovered from the Johnstown fall, making it a substantial and well-documented diogenite. Specimens are distributed across major museum and research collections worldwide.
What is the composition of the Johnstown meteorite?
Johnstown is coarse-grained and orthopyroxene-rich, consistent with its diogenite classification. This mineralogical makeup links it to deep-crustal igneous processes on its parent body, believed to be the asteroid Vesta.
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