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Sagot :
Anorthosites, almost entirely made of plagioclase feldspar, are the Moon's earliest rocks. They appear to have developed when feldspar crystallised and floated to the top of the Moon's early magma ocean.
Anorthosite is an intrusive igneous rock made primarily of calcium-rich plagioclase feldspar. All anorthosites found on Earth are coarse crystals, but some Moon samples are finely crystalline. It is almost entirely composed of plagioclase feldspar, a standard, light-weight, light-coloured mineral on Earth. It is an igneous rock that cools and solidifies from hot melting material. This mineral floated to the surface and created anorthosite. Anorthosite is a significant rock type on the Moon's surface, accounting for most of the highlands and crust. This sample, recovered by Apollo 16 astronauts, has been proven to be 4.19 billion years old.
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