Polyhalite specimens for sale
1 for sale · $1,750 USD
1 in the gallery
Polyhalite is a hydrated sulfate mineral with the chemical formula K2Ca2Mg(SO4)4·2H2O. It typically forms as soft, earthy to granular masses and can occur as white to colorless crystals in well-formed specimens. The mineral’s luster is generally vitreous to pearly, and its cleavage is imperfect, reflecting its sulfate composition. Polyhalite commonly crystallizes in low-temperature hydrothermal environments and evaporite settings, often associated with other evaporite minerals. Notable specimens have been reported from German localities, where compact aggregates and occasional crystal fans can highlight the mineral's texture and pale color in hand specimens.
- Formula
- K2Ca2Mg(SO4)4 · 2H2O
- Rarity
- Rare
- Stability
- Stable
- Collector interest
- High Interest
- Classification notes
- Sulfates with water of hydration; hydrated potassium calcium magnesium sulfate (IMA type species)
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Where Polyhalite is found
Top localities
- Kohnstein Quarry1 specimen
About Polyhalite
Collectors value polyhalite for its rarity in some regions and its mineralogical context as a hydrated sulfate. While not among the most dramatic sulfates, its crystal habits, when encountered in well-preserved, translucent to opaque masses, offer appealing options for display and study. The mineral’s combination of composition, habit, and occurrence in evaporitic environments makes it a worthwhile addition for those building a focused collection of sulfate minerals or seeking examples from German sources.