Most abun­dant min­eral named

Down to Earth - - COVER STORY - THE MIN­ERAL

that makes 38 per cent of Earth has fi­nally been named—bridg­man­ite. For around 50 years, the min­eral, a form of mag­ne­sium iron sil­i­cate found 660 km in­side Earth, could not be stud­ied or named be­cause it did not sur­vive the trip to the sur­face and its prop­er­ties re­mained un­known. How­ever, me­te­orites that fall on Earth have the same el­e­ment in "frozen" form. X-ray anal­y­sis of Ten­ham, a meteorite that crashed in Australia in 1879 and had bridg­man­ite grains, re­vealed that min­eral con­tains high amounts of fer­ric iron and sodium. Science, Novem­ber 28

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