$100Median
3Sold (12 mo)
$100Last sale
Fayalite
6 in the gallery
Fayalite is an iron-rich silicate mineral in the olivine group, typically forming as orthorhombic, granular to prismatic crystals with a vitreous to submetallic luster. It commonly appears in peridotite and other ultrabasic rocks, and when well-formed crystals crystallize in igneous environments they can display a subtle, yellowish to olive-brown color that deepens in larger specimens. The mineral’s appearance, habit, and association with coexisting olivine and magnetite at high-temperature localities contribute to its recognized identity among collectors.
- Formula
- Fe2+2SiO4
- Rarity
- Common
- Stability
- Stable
- Collector interest
- Moderate Interest
- Classification notes
- Silicate minerals — Nesosilicates; Olivine group
Where Fayalite is found
Top localities
- Bellerberg volcano2 specimens
- Arizona1 specimen
- Canary Islands1 specimen
About Fayalite
Notable specimens come from classic North American and European sourcing areas, including locales in the USA and Germany, where Fayalite has been found in ultramafic intrusions and metamorphic rocks. Localities that yield sharp, well-formed crystals are especially sought after for display and study, as Fayalite specimens can exhibit excellent crystal form and notable association with mineral assemblages that highlight the geologic history of their rocks. Collectors value Fayalite for its historical context, mineralogical clarity, and the visual appeal of its color and habit within assemblages that document ultrabasic rock formation.
