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出典:Wiktionary
Latin sideritis (“lodestone”), from Ancient Greek σιδηρῖτις (sidērîtis, “loadstone”).
siderite (countable かつ uncountable, 複数形 siderites)
出典:Wikipedia
出典:『Wikipedia』 (2011/07/24 00:13 UTC 版)
Siderite is a mineral composed of iron carbonate FeCO3. It takes its name from the Greek word σίδηρος sideros, “iron”. It is a valuable iron mineral, since it is 48% iron and contains no sulfur or phosphorus. Both magnesium and manganese commonly substitute for the iron.
Siderite