Osmiridium

Japanese: オスミリジウム - おすみりじうむ
Osmiridium

…a naturally occurring mixture of platinum group elements, also called osmiridium. It is extremely hard and corrosion-resistant, so it was used to attach to the tip of a fountain pen.

From [Elemental Minerals]

...More than 30 kinds of elemental minerals are known. Elemental minerals include metallic elemental minerals such as native gold (Au), native silver (Ag), native copper (Cu), native iron (Fe), native nickel iron (Ni,Fe), native platinum (Pt), native ruthenium (Ru), iridium (Os,Ir), and osmiridium (Ir,Os), semimetallic elemental minerals such as native arsenic (As), native antimony (Sb), aremonite (AsSb), native sulphide (Bi), and native tellurium (Te), and three subtypes of nonmetallic elemental minerals: native sulfur (S), graphite (C), and diamond (C). Native gold occurs mainly in association with quartz in various gold-silver deposits (hydrothermal vein deposits, contact metasomatic deposits). ...

*Some of the terminology explanations that mention "osmiridium" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…天然に産出する白金族元素の混合物で,オスミリジウムosmiridiumとも呼ばれる。きわめて硬く,耐食性がすぐれているので,万年筆のペンの先端につけて使用された。…

【元素鉱物】より

…30種以上の元素鉱物が知られている。元素鉱物には,自然金Au,自然銀Ag,自然銅Cu,自然鉄Fe,自然ニッケル鉄(Ni,Fe),自然白金Pt,自然ルテニウムRu,イリドスミン(Os,Ir),オスミリジウム(Ir,Os)などの金属元素鉱物,自然ヒ(砒)(別名,自然ヒ素)As,自然アンチモンSb,アレモン鉱AsSb,自然ソウ鉛Bi,自然テルルTeなどの半金属元素鉱物,および自然硫黄S,グラファイトC,ダイヤモンドCの非金属元素鉱物の3亜類がある。自然金は,各種金銀鉱床(熱水鉱脈鉱床,接触交代鉱床)中におもに石英に伴われて産する。…

※「オスミリジウム」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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