The team crushed a sample containing
tiny crystals of osmium and liquid argon between the jeweled jaws of a
diamond anvil, which exerts several hundred tons per square centimeter of pressure.
In a lab at Ohio State, the researchers compress different minerals that are common to the mantle and subject them to high pressures and temperatures using a
diamond anvil cell — a device that squeezes a
tiny sample of material between two
diamonds and heats it with a laser — to simulate conditions in the deep Earth.