Ferroedenite specimens for sale
1 for sale · $200 USD
Ferroedenite is a rare inosilicate mineral with a complex chemical composition that includes iron and sodium. It typically occurs in prismatic to tabular crystals and can display a dull to resinous luster, sometimes forming well-defined, elongated prisms. The coloration ranges from orange-brown to reddish-brown, contributing to its striking appearance in hand specimens. Crystals may occur in fibrous or slender aggregates, and the mineral often associates with other nanoscale iron silicates in oxidized metamorphic or alkaline igneous environments.
- Formula
- NaCa2Fe2+5(Si7Al)O22(OH)2
- Rarity
- Rare
- Stability
- Stable
- Collector interest
- Moderate Interest
- Classification notes
- Amphibole group; Inosilicate double-chain
Key characteristics
- Crystal system
- monoclinic
- Mohs hardness
- 5–6
- Specific gravity
- 3.2–3.6
- Luster
- vitreous
- Transparency
- translucent, opaque
- Color
- green, brown, black
- Streak
- white, gray
- Cleavage
- perfect
- Fracture
- uneven, splintery
- Crystal habit
- prismatic, acicular, fibrous, granular, massive
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About Ferroedenite
Notable specimens have been reported from localities such as Iceland and Russia, where distinctive hydrothermal and alkaline conditions promote the growth of ferroedenite-rich assemblages. Collectors value samples for their unusual composition and the rarity of pristine crystals, as well as the mineral’s potential to illustrate complex silicate structures involving iron and sodium substitutions. Its presence broadens the gallery of iron-bearing silicates and provides a window into high-temperature geological processes.