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A transparent green iron silicate mineral that occurs naturally as an iron-rich variety of Olivine. Fayalite was named after Fayal, an island in the Azores. The brittle green stone is also produced synthetically as a common component in slag stringers from ancient iron working furnaces.


Fayalite, Upper Bear Creek CO.PNG

Synonyms and Related Terms

olivine; faialite (Port.); Fayalit (Deut.); fayaliet (Ned.)

Other Properties

Crystal system= orthorhombic Color= green to pale yellow Fracture = conchoidal to uneven. Luster = vitreous. Streak = colorless.

Composition Fe2SiO4
Mohs Hardness 6.5 - 7.0
Density 4.4
Refractive Index 1.83; 1.87; 1.88

Additional Information

Mineralogy Database: Fayalite

Sources Checked for Data in Record

  • David C. Scott, Metallography and Microstructure of Ancient and Historic Metals, The Getty Conservation Institute, Los Angeles, 1991
  • C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
  • Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942

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