Gaylussite
4 in the gallery
Gaylussite is a hydrated carbonate mineral with the formula Na2Ca(CO3)2·5H2O. It typically forms in low-temperature, evaporitic environments as colorless to white, transparent to translucent crystals that can appear tabular or prismatic, often with a glassy to vitreous luster. Notable specimens have come from evaporite settings in Egypt, the United States, and Kenya, where microcrystalline habits and well-formed crystals are sought after by collectors.
- Formula
- Na2Ca(CO3)2 · 5H2O
- Rarity
- Common
- Stability
- Unstable
- Collector interest
- High Interest
Where Gaylussite is found
Top localities
- El-Hamra Lake3 specimens
- Searles Lake1 specimen
About Gaylussite
The mineral’s rarity and aesthetic appeal stem from its delicate, often prismatic crystals and needle-like habits, which can be enhanced when crystallized in cavities or spherulitic aggregates. Gaylussite is commonly associated with other evaporite carbonates and can be stabilized in museum displays due to its fragility when exposed to dehydration; care is usually required to prevent dehydration and alteration. Collectors value well-preserved, pristine specimens that clearly show crystal faces and termination, as well as representative samples from historically significant localities.]