euxenite
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…Niobium and tantalum have very similar properties, and in nature they are always found together. Fergusonite ABO 4 , euxenite AB 2 O 6 (orthorhombic crystal system, specific gravity about 5), samarskite (chemical formula intermediate between AB 2 O 6 and ABO 4 , both with A + B being half the number of O. In the crystal, the following elements A and B can be substituted for each other, making it difficult to express them in a single chemical formula.… *Some terminology explanations that mention "euxenite" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
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…ニオブとタンタルは性質が酷似していて，天然には常に両者相伴って存在する。フェルグソン石fergusonite ABO4，ユークセン石euxenite AB2O6(斜方晶系，比重約5)，サマルスキー石samarskite(化学式はAB2O6とABO4の中間の組成で，どちらもA＋Bの数がOの数の1/2である。結晶中で次のAとBの元素が互いに入れかわりうるため，一つの化学式で示しにくい。… ※「euxenite」について言及している用語解説の一部を掲載しています。 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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