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Fayalite

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fayalite [fə′yä‚līt]
(mineralogy)
Fe2SiO4A brown to black mineral of the olivine group, consisting of iron silicate and found either massive or in crystals; specific gravity is 4.1.
Fayalite 

a mineral of the olivine group; the final member of the forsterite-fayalite solid-solution series. Fayalite has the chemical composition Fe2[SiO4], and it contains up to 10 percent of the forsterite component. It is found with acidic and alkalic rocks, metamorphosed iron-rich sediments, pegmatites, and other rocks. Fayalite is also detected in industrial slags.
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Fayalite then solidifies around the grains, gluing the sand onto the surface of the casting.
It's Time to Play, Name ... That ... Green Sand Casting Defect! by Spada, Alfred T. / Modern Casting
The role of iron oxide in preventing porosity has long been linked with its ability to react with silica to form fayalite, which forms a "physical" barrier, preventing gas solution.
Porosity in Iron Castings from Mold-Metal Interface Reactions by Naro, R.L. / Modern Casting
Most foundrymen were taught that seacoal acts by burning and producing a reducing atmosphere, which prevents oxidation of the cast iron, and consequently prevents the formation of fayalite and ultimately Penetration.
Understanding metal penetration in green sand: cast iron by Pattabhi, Ravi / Modern Casting
 
 
 
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