[fey-uh-lahyt, fahy-ah-lahyt]
noun Mineralogy.
the iron end member of the olivine group, Fe 2 SiO 4 .

1835–45; named after Fayal; see -ite1

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World English Dictionary
fayalite (ˈfeɪəˌlaɪt, faɪˈɑːlaɪt)
a rare brown or black mineral of the olivine group, consisting of iron silicate. Formula: Fe2SiO4
[C19: named after Fayal]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
fayalite   (fā'ə-līt')  Pronunciation Key 
See under olivine.
The American Heritage® Science Dictionary
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