Among these, one stands out as the rarest of them all: taaffeite. Taaffeite holds the title of the rarest crystal on Earth.

By observing the anomalies in the Earth's mantle and comparing them to matter surrounding them, the researchers suggested ...

The Moon is Earth’s most reliable partner in space, having orbited our world for around 4.5 billion years—nearly as long as our planet has existed. But new analysis of crystals from the Moon ...