Abstract
Single crystals of fayalite (Fe 2SiO 4) have been prepared by the floating-zone method using a lamp-image furnace, under an atmosphere with controlled oxygen fugacity. The growth axes were 〈100〉, 〈010〉 and 〈001〉. The crystals are typically 6–8 mm in diameter and 70–100 mm long. Chemical analysis shows that the crystal composition is very close to stoichiometric. The bulk density is 4.393 g/cm 3, in good agreement with the X-ray density, 4.392 g/cm 3. The relation between the growth conditions and the phase equilibria is discussed.
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