Bastnasite 5.68 ct Rare Earth Mineral Exceptional quality Collector's Gem

Item Information

Dimensions (mm) 9 x 9 x 5.8mm
Weight (carats) 5.685 carats
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    Bastnasite is a rare earth carbonate mineral that belongs to the class of the rare earth fluorocarbonates. It was first discovered in Bastnäs mines, located in the Riddarhyttan area of Västmanland, Sweden, from which it derives its name.

    Physical Properties:

    Bastnasite has a chemical formula of (Ce,La,Nd)CO3F and has a hardness of 4.5-5 on the Mohs scale. It typically forms as prismatic or tabular crystals, but can also occur as massive or granular aggregates. It has a vitreous to resinous luster and can be transparent to translucent in appearance. Its color can range from yellow to brown, green, or reddish-brown, depending on the rare earth element composition.

    Formation and Occurrence:

    Bastnasite is primarily found in carbonatite and alkaline igneous rocks, where it forms as a result of hydrothermal alteration. It is also associated with pegmatite veins and has been found in sandstones, shales, and gneisses. Bastnasite is typically found in association with other rare earth minerals such as monazite, xenotime, and allanite. It is widely distributed around the world, with significant deposits found in China, the United States, Brazil, and India.

    Industrial Applications:

    Bastnasite is an important source of rare earth elements, which are crucial in the production of high-tech materials and devices. Rare earth elements are used in the production of magnets, catalysts, alloys, and phosphors, which are essential in a wide range of industries including electronics, telecommunications, defense, and renewable energy. Bastnasite is typically processed through a series of steps, including crushing, milling, and flotation, to extract the rare earth elements it contains.

    Environmental Concerns:

    The extraction and processing of rare earth elements from bastnasite and other sources can have significant environmental impacts. The process typically involves the use of large amounts of water, energy, and chemicals, which can result in the production of toxic waste and emissions. The disposal of this waste can have negative impacts on water quality and soil health, and can contribute to air and water pollution. There is ongoing research to develop more environmentally sustainable methods for extracting rare earth elements from bastnasite and other sources.


    Bastnasite is a valuable mineral with important industrial applications as a source of rare earth elements. Its physical properties, formation, and occurrence make it a unique and significant mineral in the global mining industry. However, its extraction and processing pose significant environmental challenges that require ongoing attention and innovation.

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Bid Increment $1
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Auction ID 590523
Watchers 27 watching
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Starts 15th May 2023 5:31am PDT
Ends 29th May 2023 5:31am PDT

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