General formula:

Fe2SiO4

N° standard / mount: 086 / Tubes
Standard elements: Fe Si
Mineral class: Silicates
Group: Olivine
Locality: Rockport, MA, USA
Comments:

mostly homogeneouys, some inclusions (FeO, ferrosilite, …)

Analysis:
Fayalite (Rockport) Analysis
Fayalite (Rockport)