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Description
Syngenite 1.51 ct. Cushion Cut 10.90 x 6.50 mm z522
SYNGENITE
An hydrated Potassium,Calcium sulfate with formula K2Ca(SO4)2-(H2O) and hardness 2.5.
Typical evaporite saline mineral or volcanic sublimate; soluble in water.
Rarely transparent, often included with lots of impurity. This gem here comes from Kalush ( also called Kalushite) deposit,Ucraina.
