Mirabilite
A variety of Minerals
What is Mirabilite?
Mirabilite, also known as Glauber's salt, is a hydrous sodium sulfate mineral with the chemical formula Na2SO4·10H2O. It is a vitreous, colorless to white monoclinic mineral that forms as an evaporite from sodium sulfate-bearing brines. It is found around saline springs and along saline playa lakes. Associated minerals include gypsum, halite, thenardite, trona, glauberite, and epsomite. Mirabilite is unstable and quickly dehydrates in dry air, the prismatic crystals turning into a white powder, thenardite (Na2SO4). In turn, thenardite can also absorb water and converts to mirabilite. Mirabilite is used as a purgative in the Traditional Chinese medicine; in Mandarin, it is called máng xiāo. The name 'mirabilite' is based on the phrase "Sal mirabilis" (Latin for "wonderful salt") used by Johann Rudolph Glauber when he inadvertently synthesized mirabilite.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Mirabilite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Mirabilite Localities Map
See where Mirabilite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Colourless, white; colourless in transmitted light
- Hardness (Mohs)
- 1.5 - 2
- Density
- 1.49 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- Na2SO4 · 10H2O
- Elements
- H, Na, O, S
Also Known As
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Mirabilite FAQs
How do I identify Mirabilite?
Mirabilite can be identified by its hardness of 1.5 - 2 on the Mohs scale, Colourless color. Look for these key characteristics when examining specimens.
What color is Mirabilite?
Mirabilite typically appears in Colourless, white; colourless in transmitted light. Color can vary depending on impurities and formation conditions.
How hard is Mirabilite?
Mirabilite has a hardness of 1.5 - 2 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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