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Emmonsite
4 in the gallery
Emmonsite is a hydrated iron tellurate mineral that forms as small, usually vitreous crystals in oxidized tellurite-rich environments. It typically exhibits a yellow to orange color with a bright, glassy lustre and a habit that can include prismatic or tabular crystals, sometimes forming aggregates that catch the eye of collectors. The mineral’s composition and structure reflect the presence of iron in its Fe3+ state and tellurate groups, contributing to its distinctive warm coloration and clear crystal faces when well-formed.
- Formula
- Fe3+2(TeO3)3 · 2H2O
- Rarity
- Rare
- Stability
- Moderately Stable
- Collector interest
- Niche Interest
Where Emmonsite is found
About Emmonsite
Notable specimens come from environments where tellurite minerals are stable, and Mexico and the United States are cited sources that have produced well-documented crystals. Crystallographic forms can be small but sharply defined, and when present in a polished specimen, Emmonsite can display a vibrant contrast against matrix minerals, enhancing its display value in a collection. Collectors often seek Emmonsite for its unique chemical makeup and the mingling of color and transparency that can occur in high-quality pieces, as well as for the insight it provides into oxidized tellurium-rich assemblages.
