Arsenate minerals - arsenate mineral

Japanese: ヒ酸塩鉱物(砒酸塩鉱物) - ひさんえんこうぶつ（英語表記）arsenate mineral

A salt mineral containing the arsenate radical (AsO ₄ ) ³⁻ as its basic chemical component. It exists in the anhydrous, acidic salt, and hydrated forms, and also in species in which some of the arsenic As is replaced by atoms such as phosphorus P or vanadium V. The crystal structure is based on a tetrahedron of AsO ₄ , forming the framework of the structure. For this reason, many minerals are isomorphous with phosphate minerals, which are salt minerals of the (PO ₄ ) ³⁻ group, and vanadate minerals, which are salt minerals of the (VO ₄ ) ³⁻ group, both of which have a similar tetrahedral structure. It often occurs as a secondary mineral in the oxidation zones of mines that contain such minerals, as a decomposition product of arsenic minerals, especially arsenic sulfide minerals.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ヒ酸根(AsO₄)^3－を基本の化学成分として含有する塩類鉱物。無水物，酸性塩，含水物などがあり，またヒ素Asの一部をリンP，バナジウムVなどの原子で置換された種も存在する。結晶構造としてはAsO₄の四面体が基本となって構造の骨組みをつくる。このため同様な四面体を基本にもつ(PO₄)^3－の塩類鉱物であるリン酸塩鉱物および(VO₄)^3－の塩類鉱物であるバナジウム酸塩鉱物と同形の関係にある鉱物が多い。　ヒ素鉱物，とくに硫化ヒ素鉱物の分解物として，このような鉱物を含有する鉱山などの酸化帯に二次鉱物として産出する場合が多い。

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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