Pickeringite
A variety of Minerals
What is Pickeringite?
Pickeringite is a magnesium aluminium sulfate mineral with formula MgAl2(SO4)4·22(H2O). It forms a series with halotrichite. It forms as an alteration product of pyrite in aluminium rich rocks and in coal seams. It also occurs in pyrite rich hydrothermal ore deposits in arid regions. It forms in fumaroles and in caves. It occurs with kalinite, alunogen, epsomite, melanterite, copiapite and gypsum. It was first described in 1844 for an occurrence in Cerros Pintados, Pampa del Tamarugal, Iquique Province, Tarapacá Region, Chile. It was named for American linguist and philologist John Pickering (1777–1846).
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Pickeringite 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.
Pickeringite Localities Map
See where Pickeringite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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Quick Facts
Physical Properties
- Color
- Colourless to white, light yellow, pale pink, gray; colourless in transmitted light
- Hardness (Mohs)
- 1.5 - 2
- Density
- 1.84 g/cm³
Chemical Properties
- Chemical Formula
- MgAl2(SO4)4 · 22H2O
- Elements
- Al, H, Mg, O, S
Also Known As
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Pickeringite FAQs
How do I identify Pickeringite?
Pickeringite can be identified by its hardness of 1.5 - 2 on the Mohs scale, Colourless to white color. Look for these key characteristics when examining specimens.
What color is Pickeringite?
Pickeringite typically appears in Colourless to white, light yellow, pale pink, gray; colourless in transmitted light. Color can vary depending on impurities and formation conditions.
How hard is Pickeringite?
Pickeringite 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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