description Alais Overview
Alais is a CI1 carbonaceous chondrite that fell near Alais, now called Ales, in southern France in 1806. CI meteorites are chemically primitive, rich in hydrated minerals, and notable for elemental compositions that closely resemble the nonvolatile composition of the Sun, although their original textures have been heavily altered by water. Claims made during the twentieth century that Alais contained fossil microorganisms were not accepted as evidence of extraterrestrial life and were attributed to contamination or misinterpretation.
insights Ranking position
Alais ranks #46 of 213 in the Meteorite ranking, behind Kapoeta, ahead of Bishunpur.
help Alais FAQ
Why is Alais classified as a CI1 carbonaceous chondrite?
Its CI classification reflects a chemically primitive composition rich in volatile elements, while type 1 indicates extensive alteration by water on its parent body. As a result, recognizable chondrules are largely absent even though the meteorite belongs to the broader chondrite family.
When and where did the Alais meteorite fall?
Alais fell near the town now called Alès in southern France in 1806. It was the first recognized fall of the rare CI carbonaceous-chondrite group.
Why do scientists compare Alais with the composition of the Sun?
CI meteorites contain nonvolatile elements in proportions that closely match measurements of the solar photosphere. Researchers therefore use material such as Alais as a reference for the primitive chemical composition of the solar system.
Why is Alais darker and more fragile than an ordinary chondrite?
Its fine-grained matrix contains carbon-bearing material and abundant hydrated minerals produced by aqueous alteration. CI stones are consequently dark, friable, and especially vulnerable to terrestrial moisture and contamination.
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