Vivianite (vivianiite)

Japanese: ラン鉄鉱(藍鉄鉱) - らんてっこう(英語表記)vivianite
Vivianite (vivianiite)
A deep blue iron phosphate mineral. Its chemical composition is Fe 2+ 3 (PO 4 ) 2 ・8H 2 O. Some of the Fe may be replaced by Mn 2+ , Mg, Ca, etc. In fresh, unoxidized specimens, the iron is a divalent atom and its color is colorless to white or yellowish, but as Fe 2+ oxidizes to Fe 3+ , it gradually changes color from light blue to dark green to deep blue. Minerals that show such a color change are rare, but this is a particularly striking example. In most cases, it is in an oxidized state and is colored blue, hence the name.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
濃青色を示すリン酸鉄鉱物。化学成分はFe2+3(PO4)2・8H2O。Feの一部をMn2+,Mg,Caなどで置換することがある。新鮮で未酸化のものでは,鉄は2価の原子であり,その色は無色~白色,帯黄色であるが,Fe2+がFe3+に酸化するに従いしだいに淡青色から暗緑色,濃青色に変色する。このように色彩の変化を示す鉱物は珍しいが,その中でも著しい例とされている。多くの場合は酸化状態にあり青色に着色しているため,その名称がつけられた。

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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