コランダム
1. corundum
2. CorundumCorundum is a crystalline form of aluminium oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally clear transparent materials, but can have different colors when impurities are present. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange. All other colors are called sapphire, e.g. , "green sapphire" for a green specimen.
Read “Corundum” on English Wikipedia
Read “コランダム” on Japanese Wikipedia
Read “Corundum” on DBpedia
Read “Corundum” on English Wikipedia
Read “コランダム” on Japanese Wikipedia
Read “Corundum” on DBpedia
Discussions
Log in to talk about this word.