polycrase

mineral

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July 2, 2026

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Polycrase is a mineral with the chemical formula (Y,Ca,Ce,U,Th)(Ti,Cb,Ta)₂O₆. It is a columbate and titanate of metals from the yttrium group and is isomorphous with euxenite. This mineral has a hardness of 5–6 and a specific gravity of 5. Polycrase is related to other rare-earth-containing minerals like euxenite and xenotime. While not as commonly mined as bastnasite or monazite, minerals like euxenite and xenotime have been used as sources for rare earths, particularly the heavier lanthanides and yttrium.123

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euxenite
…to form the similar mineral polycrase; both it and euxenite often contain rare earths. These minerals are widespread in Norway, Madagascar, and Canada and also occur in Sweden, Finland, Greenland, Australia, Brazil, and the U.S. For chemical formula and detailed physical properties, see oxide mineral (table).
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…to form the similar mineral polycrase; both it and euxenite often contain rare earths. These minerals are widespread in Norway, Madagascar, and Canada and also occur in Sweden, Finland, Greenland, Australia, Brazil, and the U.S. For chemical formula and detailed physical properties, see oxide mineral (table).
Read More