By Colleen Howe

BEIJING (Reuters) -Global manufacturers have raised the alarm on China’s decision to curb exports of rare earths alloys, mixtures and magnets.

Here is an overview of rare earths and China’s measures:

WHAT ARE THEY?

Rare earths are a group of 17 silvery-white elements. One of their most important uses is in making magnets that power motion for cars, cell phones, missiles and other electronics.

ARE THEY RARE?

While not rare in the sense of being uncommon, they tend to occur in small quantities or mixed with other minerals, making extraction difficult and costly.

WHICH COUNTRY IS THE BIGGEST PRODUCER?

China mines about 60% of the world’s rare earths and makes 90% of rare earth magnets. It sets quotas on output, smelting, and separation, which are monitored as a baromet

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