Lecontite

General Information:
 Chemical Formula:
(NH4,K)Na(SO4)·2(H2O)
 Composition:
(Molecular Weight = 178.39 gm)
Potassium 5.48 % K 
Sodium 12.89 % Na
Hydrogen 3.96 % H 
Sulfur 17.98 % S 
Nitrogen 5.89 % N 
Oxygen 53.81 % O 
 Empirical Formula:
NH40.75K0.25Na(SO4)·2(H2O)
Physical Properties:
 Cleavage:
[011] Distinct
 Color:
colorless.
 Density:
1.745
 Diaphaniety:
Transparent
 Hardness:
2-2.5 - Gypsum-Finger Nail
 Luster:
Vitreous (Glassy)
 Streak:
white
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