Polycrase

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Polycrase or polycrase-(Y) is a black or brown metallic complex uranium yttrium oxide mineral It is amorphous, with a Mohs hardness of 5 to 6 and a specific gravity of 5, and radioactive due to its uranium content (around 6%). It occurs in granitic pegmatites.

Polycrase

Caelestis Indomitus Tanelornpete