Fayalite
Chemical compound
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Fayalite is the iron-rich end-member of the olivine solid-solution series. In common with all minerals in the olivine group, fayalite crystallizes in the orthorhombic system with cell parameters a 4.82 ... Wikipedia
Crystal system: Orthorhombic
Refractive index: nα = 1.731 – 1.824 nβ = 1.760 – 1.864 nγ = 1.773 – 1.875
Formula mass: 203.771 g·mol−1
2V angle: Measured: 74° to 47°, Calculated: 54° to 66°
Birefringence: δ = 0.042 – 0.051
Cleavage: moderate,, imperfect
Color: Greenish yellow, yellow-brown, brown; pale yellow to amber in thin section