Jisho

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くろだま 黒玉
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Noun
1. black ball​
Noun
2. black, round sigil​
Noun
3. pupil​
Noun
4. black candy​
Wikipedia definition
5. Jet (lignite)​Jet is a geological material and is considered to be a minor gemstone. Jet is not considered a true mineral, but rather a mineraloid as it has an organic origin, being derived from decaying wood under extreme pressure. The English noun "jet" derives from the French word for the same material: jaiet. Jet is either black or dark brown, but may contain pyrite inclusions, which are of brassy colour and metallic lustre.
Read “Jet (lignite)” on English Wikipedia
Read “黒玉” on Japanese Wikipedia
Read “Jet (lignite)” on DBpedia
Other forms
黒玉 【くろたま】

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