Ancient Anorthosite Discovery in Madagascar
A remarkable patch of anorthosite, a rock type commonly found on the Moon's bright highlands, has been identified in southern Madagascar. The formation, photographed from the International Space Station on August 28, 2026, stands out against the surrounding landscape due to its pale, almost white appearance.
Connection to Lunar Surface
Anorthosite is an igneous rock that forms a significant portion of the Moon's reflective, light-colored regions. While it may appear unusual on Earth, large deposits of this rock also occur in several areas globally, including eastern Canada, Scandinavia, southern India, and Madagascar. The specific formation in Madagascar, known as the Saririaky anorthosite massif, covers approximately 100 square kilometers (40 square miles).
Geological History and Formation
Geological research indicates that the Saririaky formation is at least 600 million years old, originating during the late Precambrian period. It is classified as an intrusive igneous rock, meaning it solidified beneath the Earth's surface, allowing minerals to develop into larger crystals. The surrounding terrain displays evidence of ancient continental collisions, with rocks deformed into long, north-south stripes due to deep burial and heating. However, the anorthosite massif has maintained its distinct, roughly circular shape.
Astronaut's Perspective
The striking image of the Saririaky anorthosite massif was captured by an astronaut using a Nikon Z9 camera with a 400-millimeter lens. NASA's Earth Observatory published the photograph on October 11, 2026, highlighting the surprising similarity between this terrestrial rock formation and the lunar surface.
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