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Ferrohortonolite is a mineral variety in the olivine series composed of 70% to 90% fayalite and 30% to 10% forsterite or Fe/(Fe+Mg) ratio of 0.7 to 0.9. It is from the obsolete hortonolite terminology for the olivine series.
- U.S. Bureau of Mines (1996). Dictionary of Mining, Mineral, and Related Terms.
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