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Wilson and her colleagues sprayed the mine’s ultramafic rock tailings with dilute sulfuric acid, causing magnesium to leach out.

Start with ultramafic wastes, the calcium- and magnesium-rich rock in which diamonds, along with metals such as nickel, platinum, and palladium are found.

Quarrying, crushing, and grinding ultramafic rocks would cost only about $10 per ton of CO2 absorbed, Wilson and her team estimate.

You need a magma that’s ultramafic, far more basic than basalt.

The abundance of major, minor and trace elements in the Earth’s mantle as derived from primitive ultramafic nodules.