|
| Colorful English! | ||||
| Word or Phrase: | Part of Speech: | Idiom or General?: | Usage? | Restricted? |
| black diamond | noun | idiom | fairly common | No |
| Meaning: | ||||
| a nickname for coal, because of its value in heating and industry | ||||
| Example(s): | ||||
| Those hills are filled with black diamonds. | ||||
| Note: Some sources also use this term to describe dense black hematite; however, the name hematite itself comes from the Greek word for blood. Hematite does come in two colors, dark red and black. | ||||