We discovered a new rock type containing garnet inside a meteorite fragment from Mars
On Earth, garnet is best known as the fiery red January birthstone—popular in jewelry since the Bronze Age and valued highly by ancient Egyptians.
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Hidden role of garnet reveals how Earth's 660-km seismic boundary forms
Nearly 660 kilometers (410 miles) beneath Earth's surface lies one of the planet's most important internal boundaries. Known as the 660-km seismic discontinuity, it separates the mantle transition zone from the lower mantle and plays a central role in controlling how heat and mat