Fayalite [ FeII2(SiO4) ]

Material properties

Formulas (FeII,Mg)2(SiO4), Fe2SiO4, FeII2(SiO4)
Abbreviation Fa
IMA Status Grandfathered (pre-IMA), 1840
Crystal symmetry Orthorhombic, Point group mmm
Classifications Minerals containing SiO4, Forsterite-Fayalite (series), Olivine
Variants lunar, Mg
Search other databases webmineral.com, mindat.org, rruf.info, mineralienatlas.de, Handbook of Mineralogy, American Mineralogist Crystal Structure Database
Tags Lunar, Mineral, Silicate

Composition

Element Atoms
Si 1
Fe 2
O 4
Total: 7

Specimens of Fayalite

Name Owner Materials Phase purity Image Spectra Techniques
MES084 Ferrosilite CSIRO Enstatite (var. Fe), Fayalite (var. Mg) (19.0%), Ilmenite, Labradorite, Phlogopite (var. Fe), Quartz 19.0 0 —
Apollo 12032-366-19x NASA Alkali feldspar (var. lunar), Apatite (var. lunar), Baddeleyite (var. lunar), Fayalite (var. lunar), Hedenbergite (var. lunar), Ilmenite (var. lunar), Merrillite (var. lunar), Plagioclase (var. lunar), Silica (var. lunar), Troilite (var. lunar), Zirconolite (var. lunar) — 6 CL