Tschermigite
A variety of Minerals
What is Tschermigite?
Tschermigite is a mineral form of ammonium alum, formula NH4Al(SO4)2·12(H2O). It is found in burning coal seams, bituminous shale and fumaroles. Because of its extreme water solubility it is unlikely to persist except in the dryest of conditions. Discovered in 1852 at Cermiky, also known as Tschermig in Bohemia. It is colorless and named for where it was discovered.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Tschermigite 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.
Tschermigite Localities Map
See where Tschermigite 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
- 1.641 g/cm³
Chemical Properties
- Chemical Formula
- (NH4)Al(SO4)2 · 12H2O
- Elements
- Al, H, N, O, S
Also Known As
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Tschermigite FAQs
How do I identify Tschermigite?
Tschermigite 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 Tschermigite?
Tschermigite typically appears in Colourless, white; colourless in transmitted light. Color can vary depending on impurities and formation conditions.
How hard is Tschermigite?
Tschermigite 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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