forsterite

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for·ster·ite

 (fôr′stə-rīt′)
n.
A whitish or yellowish form of the mineral olivine, Mg2SiO4, in which the mafic component consists entirely of magnesium.

[After Adolarius Jacob Forster (1739-1806), English mineral collector.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

forsterite

(ˈfɔːstəˌraɪt)
n
(Minerals) a white, yellow, or green mineral of the olivine group consisting of magnesium silicate. Formula: Mg2SiO4
[C19: named after J. R. Forster (1729–98), German naturalist]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014