A widely-distributed iron ore occurring in crystalline, massive or granular forms. It is opaque and generally dark grey (almost black) in colour. It is cut en cabochon or as beads, though in Germany it is also used for intaglios. It is similar to steel in appearance, but much darker.Set with gold, it makes a very attractive colour contrast. It may be confused with black pearl, for which it is sometimes used as an imitation, but which has a less metallic sheen.
It is found in Italy, Germany, France, England, Switzerland and Madagascar.
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