This rare, greasy clay mineral could be the future of our lithium supply

Nature · Published 3 October 2026 Swipe more like this →

In short: Hectorite is a soft, white, lithium-rich clay that feels greasy to the touch. While it has long been a staple ingredient in luxury cosmetics, its unique chemical structure and significant presence in major volcanic deposits are positioning this rare mineral as a critical player in the global race for lithium.

First described in 1941, hectorite is a member of the smectite group of minerals. It is classified as a swelling 2:1 clay, meaning its structure allows it to expand significantly when exposed to water. This physical property, combined with its chemical composition—represented by the formula Na0.3(Mg,Li)3Si4O10(OH)2—makes it highly versatile for industrial applications, ranging from chemical stabilizers to high-end beauty products.

Geologically, hectorite forms as an alteration product of clinoptilolite, which originates from volcanic ash and tuff with high glass content. While it is considered rare, it appears in specific environments globally. Notable occurrences include the beige and brown clay known as ghassoul, which is mined in the Atlas Mountains of Morocco. In the United States, the mineral was first identified near Hector, California, located 30 miles east of Barstow in San Bernardino County.

The most significant modern interest in hectorite stems from its potential as a source of refined lithium metal. A massive deposit exists at the Thacker Pass site within the McDermitt Caldera in Nevada. Because the original Hector mine sits atop a substantial deposit, the mineral remains economically viable to extract despite its overall rarity. As demand for lithium continues to rise, the ability to process hectorite into battery-grade materials is becoming a focal point for resource development, potentially transforming this obscure clay into a cornerstone of the green energy transition.

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