Noun
English Wikipedia has an article on:mischmetalWikipedia
mischmetal (countable and uncountable, plural mischmetals)
An alloy of rare earth elements containing about 50% cerium and 50% lanthanum, neodymium, and similar elements used especially as a flint in cigarette lighters
Comparison with ferrocerium Flint and steel used to strike sparks were superseded by ferrocerium (sometimes referred to as "flint", although not true flint, " mischmetal ", "hot spark", "metal match", or "fire steel"). Source: Internet
Due to high cost to extract the other lanthanides, a mischmetal with more than 50% of lanthanum is used instead of pure lanthanum. Source: Internet
More economically viable alloys using mischmetal instead of lanthanum were soon developed. Source: Internet