Uranium mineral - Uranium mineral

Japanese: ウラン鉱物 - ウランこうぶつ（英語表記）uranium mineral

A mineral that contains uranium. Uranium has an atomic valence of +4 in a reducing environment and +6 in an oxidizing environment. The latter usually becomes the uranyl (UO ₂ ) ²⁺ complex ion, which dissolves easily in water and is transported. For this reason, there are many mineral species that contain uranium, and there are about 140 types of minerals that contain uranium as the main component. The main ore minerals that contain U ⁴⁺ include uraninite UO ₂ (pitchblende is a variety of this), coffinite U(SiO ₄ ) _{1− x} (OH) _{4 x} , and brannerite (U,Ca,Th,Y)(Ti,Fe) ₂ O ₆ , and are generally black to dark brown in color and have a high specific gravity.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ウランを含む鉱物をいう。ウランは還元環境下で＋4，酸化環境下で＋6の原子価をとる。後者はふつうウラニル(UO₂)^2＋錯イオンとなって容易に水に溶け，運ばれる。このためウランを含む鉱物種は多く，主成分とするものだけでも約140種ある。主要鉱石鉱物は，U^4＋を含む種にはセンウラン鉱UO₂(ピッチブレンドはこの変種)，コフィン石coffinite U(SiO₄)_1－x(OH)_4x，ブランネル石brannerite(U,Ca,Th,Y)(Ti,Fe)₂O₆などがあり，おおむね黒～暗褐色で比重が大きい。

出典　株式会社平凡社世界大百科事典第２版について　情報

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