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Hectorite

earth science Maturity 7-9 Next article →

Hectorite is a very rare type of clay mineral. It is white and soft to the touch. This clay feels greasy when you hold it. It is special because it is rich in lithium. This mineral belongs to the smectite group. Smectite is a group of swelling clays. These clays can expand when they get wet.

There is a specific way this clay forms. It often starts from volcanic ash. It can also come from a rock called tuff. Tuff is a rock made of volcanic ash. Hectorite forms as an alteration product. It changes from a mineral named clinoptilolite. This happens in ash that has a lot of glass.

People first described this mineral in 1941. They gave it its name from a place in the United States. This place is near Hector, California. It is located in San Bernardino County. The town of Hector is 30 miles east of Barstow. The Hector mine sits over a large amount of this clay.

Finding hectorite in the wild can be hard. You can find it in the Atlas Mountains in Morocco. There, it is part of a brown clay called ghassoul. A large deposit is also in Nevada. This is at the Thacker Pass lithium deposit. This site is inside the McDermitt Caldera. This place may be a big source of lithium.

Even though it is rare, people use it often. It is mostly used to make cosmetics. These are items like creams for your skin. It is also used in many industrial jobs. Some people use it to get refined lithium metal. This makes the mineral very useful to the world.

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