Pyrites

(noun.) any of various metallic-looking sulfides (of which pyrite is the commonest).

校对:南森

• The Kimberlite of the Jagersfontein mine is free from pyrites, and to that is attributed the remarkable brilliancy and purity of color for which the diamonds of this mine are celebrated. 佚名. 神奇的知识之书.
• In the second case, the heat is produced by a kind of fermentation; and in the third, by the pyrites of the coal rapidly absorbing and combining with the oxygen of the air. 佚名. 神奇的知识之书.

录入:佩内洛普