Thenardite specimens for sale
2 for sale · $45–$60 USD
22 in the gallery
Thenardite is a sulfate mineral with the chemical formula Na2SO4. It typically forms as transparent to white crystals in arid evaporite environments and can occur in granular to tabular habits with a vitreous to resinous luster. As a sodium sulfate, it is commonly associated with evaporite settings and can be found in dry lake beds and saline deposits, where concentrated solutions precipitate as well-formed crystals or crusts.
- Formula
- Na2SO4
- Rarity
- Common
- Stability
- Stable
- Collector interest
- Moderate Interest
- Classification notes
- Sulfates; Anhydrous sodium sulfate
Key characteristics
- Crystal system
- orthorhombic
- Mohs hardness
- 2.5–3
- Specific gravity
- 2.66–2.68
- Luster
- vitreous, resinous
- Transparency
- transparent, translucent
- Color
- colorless, white, gray, brown
- Streak
- white
- Cleavage
- perfect
- Fracture
- conchoidal, uneven
- Crystal habit
- prismatic, tabular, granular, massive
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Where Thenardite is found
Top localities
- Boron8 specimens
- Wadi El-Natrun Depression6 specimens
- El-Hamra Lake2 specimens
About Thenardite
Notable specimens have been reported from localities in the United States and Egypt, among others, where arid climates and evaporite activity promote crystallization. These specimens often display clean, prismatic crystals that can be relatively small but highly pristine, making them attractive to collectors who seek crisp forms and classic sulfate crystallography.
Collectors are drawn to Thenardite for its straightforward crystallography, its occurrence in historic evaporite classic locales, and the crisp clarity of some specimens. Although not as common as more famous sulfates, well-formed Thenardite crystals provide a window into evaporite mineralogy and the diversity of sodium sulfate minerals that form in arid environments.