Syngenite
A variety of Minerals
What is Syngenite?
Syngenite is an uncommon potassium calcium sulfate mineral with formula K2Ca(SO4)2·H2O. It forms as prismatic monoclinic crystals and as encrustations.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Syngenite 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.
Syngenite Localities Map
See where Syngenite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Formation of Syngenite
It was first described in 1872 for an occurrence as druse on halite in the Kalusa Salt deposit, Ivanovo-Frankovsk Oblast', Ukraine. The name is from Greek 'συγγενής' (related) due to its chemical similarity to polyhalite. It occurs in marine evaporite deposits as a diagenetic phase. It also forms as a volcanic sublimate, as vein fillings in geothermal fields and in caves where it is derived from bat guano. It occurs in association with halite and arcanite in salt deposits; and with biphosphammite, aphthitalite, monetite, whitlockite, uricite, brushite and gypsum in cave environments. It is also found in hardened cement which has relatively higher amount of potassium.
Quick Facts
Physical Properties
- Color
- Colourless, white, light yellow; colourless in transmitted light
- Hardness (Mohs)
- 2.5
- Density
- 2.597 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- K2Ca(SO4)2 · H2O
- Elements
- Ca, H, K, O, S
Also Known As
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Syngenite FAQs
How do I identify Syngenite?
Syngenite can be identified by its hardness of 2.5 on the Mohs scale, Colourless color. Look for these key characteristics when examining specimens.
What color is Syngenite?
Syngenite typically appears in Colourless, white, light yellow; colourless in transmitted light. Color can vary depending on impurities and formation conditions.
How hard is Syngenite?
Syngenite has a hardness of 2.5 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
What is the formation of syngenite of Syngenite?
It was first described in 1872 for an occurrence as druse on halite in the Kalusa Salt deposit, Ivanovo-Frankovsk Oblast', Ukraine. The name is from Greek 'συγγενής' (related) due to its chemical similarity to polyhalite. It occurs in marine evaporite deposits as a diagenetic phase. It also forms as a volcanic sublimate, as vein fillings in geothermal fields and in caves where it is derived from bat guano. It occurs in association with halite and arcanite in salt deposits; and with biphosphammite, aphthitalite, monetite, whitlockite, uricite, brushite and gypsum in cave environments. It is also found in hardened cement which has relatively higher amount of potassium.
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