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・ Polyene
・ Polyene antimycotic
・ Polyenoic fatty acid isomerase
・ Polyenso
・ Polyergus
・ Polycomb-group proteins
・ Polyconic projection
・ Polyconvex function
・ Polycopidae
・ Polycoria
・ Polycornum
・ Polycotylidae
・ Polycotylus
・ Polycount
・ Polycracy
Polycrase
・ Polycrasta
・ Polycrates
・ Polycrates (disambiguation)
・ Polycrates (sophist)
・ Polycrates complex
・ Polycrates of Argos
・ Polycrates of Ephesus
・ Polycratia of Argos
・ Polycrite
・ Polycrystalline silicon
・ Polyctenidae
・ Polyctenium
・ Polyctenium fremontii
・ Polyctor


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Polycrase : ウィキペディア英語版
Polycrase
Polycrase or polycrase-(Y) is a black or brown metallic complex uranium yttrium oxide mineral with formula: (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6. It is amorphous. It has a Mohs hardness of 5 to 6 and a specific gravity of 5. It is radioactive due to its uranium content (around 6%). It occurs in granitic pegmatites.
Polycrase forms a continuous series with the niobium rich rare earth oxide euxenite.
It was first described in 1870 at Rasvag, Hidra (Hittero) Island, near Flekkefjord, Norway. It is found in Sweden, Norway, and the United States.
==References==

*(Mindat with location data )
*(Webmineral )



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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