Hisingerite
A variety of Minerals
What is Hisingerite?
Hisingerite is an iron(III) phyllosilicate mineral with formula Fe2Si2O5(OH)4·2H2O. A black or dark brown, lustrous secondary mineral, it is formed by the weathering or hydrothermal alteration of other iron silicate and sulfide minerals. It was first described in 1828 for an occurrence in Riddarhyttan, Vastmanland, Sweden. It was named after Wilhelm Hisinger (1766–1852), a Swedish chemist. There are also aluminian hisingerite variety in which one of the iron atoms is replaced by aluminium and chrome-alumina-hisingerite variety in which chromium substitutes for iron.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Hisingerite 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.
Hisingerite Localities Map
See where Hisingerite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Black, Brownish-black, dark brown, dark green
- Hardness (Mohs)
- 2.5 - 3
- Density
- 3.23 g/cm³
- Streak
- Yellowish brown, green
Chemical Properties
- Chemical Formula
- Fe3+2(Si2O5)(OH)4 · 2H2O
- Elements
- Fe, H, O, Si
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Hisingerite FAQs
How do I identify Hisingerite?
Hisingerite can be identified by its hardness of 2.5 - 3 on the Mohs scale, Black color. Look for these key characteristics when examining specimens.
What color is Hisingerite?
Hisingerite typically appears in Black, Brownish-black, dark brown, dark green. Color can vary depending on impurities and formation conditions.
How hard is Hisingerite?
Hisingerite has a hardness of 2.5 - 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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