fayalite
Noun
Meaning
A black, greenish, or brownish mineral of the chrysolite group. It is a silicate of iron.
Source: Webster's dictionarySynonyms
Examples
At about 0.8 mole fraction fayalite, olivine transforms directly to ringwoodite over the pressure range convert.
Compositions of olivine are commonly expressed as molar percentages of forsterite (Fo) and fayalite (Fa) (e.
The ratio of magnesium and iron varies between the two endmembers of the solid solution series: forsterite (Mg-endmember: Mg 2 Si 4 ) and fayalite (Fe-endmember: Fe 2 Si 4 ).
Forsterite has an unusually high melting temperature at atmospheric pressure, almost convert, but the melting temperature of fayalite is much lower (about convert).