In nature, hafnium is often symbiotic with zirconium, hafnium-containing minerals contain hafnium, hafnium is homogenous with zirconium, and hafnium is predominantly present in zircon. Industrially used zircon contains 0.5-2% HfO2. HfO2 in hafnium zircon in secondary zircon ores can be as high as 15%. There is also a metamorphic zirconium, which contains more than 5% HfO2. The latter two minerals have low reserves and have not been used in industry. Hafnium is mainly recovered from the production of zirconium.
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